Advantages and disadvantages of the four strokes (technical flow angle)

In this article, we will objectively evaluate the advantages and disadvantages of the four major strokes and the four most basic strokes. As a swimmer, relevant knowledge will help you to understand swimming more deeply and make swimming and body and mind combine perfectly.

breaststroke


Breaststroke is generally one of the first strokes that beginners come into contact with. Modern breaststroke has developed into whip breaststroke leg, and the breaststroke swimmer has also been broken down into several action stages, namely, returning the arm, sliding, paddling, chest and hand, all of which are done underwater or near the surface.

The advantage of breaststroke is that the head can easily get out of the water, the front vision is not affected, and there is no big breathing problem. Another advantage is that the hands and legs of breaststroke move synchronously in the same symmetry, which is also beneficial for beginners to master the initial movements, so breaststroke is easier to learn from all strokes.

The main disadvantage of breaststroke is that it is slower than other strokes and less efficient.

backstroke


Backstroke is the easiest stroke to learn after breaststroke. Backstroke, as its name implies, is swimming on the back, and backstroke leg is also a kind of whipping leg, and it should be whipped up and down alternately.

The hands of the backstroker swing like a windmill in turn. After the straight arm comes out from the hip, the straight arm moves to the top of the head to enter the water, and then grabs, pulls and pushes the water to the hip for one cycle.

The advantage of backstroke is that once the backstroke is well balanced, breathing is not a problem at all, and it is more efficient than breaststroke, and it can also do long-distance backstroke, and it can be used as an auxiliary treatment stroke for patients with low back diseases.

Backstroke also has disadvantages. The speed of backstroke is not as fast as freestyle and butterfly. For beginners, it is not easy to master the balance of backstroke. Therefore, the nose will often get water and choke, and for beginners, swimming will be very uncomfortable because they can’t look forward.

freestyle


Freestyle requires swimmers to lie prone, and the leg movements are the same as backstroke legs, which are also whipping legs, and they should be whipped up and down in a cross way. The hand movements require that the arm should be pulled back from near the thigh and head into the water, and then the water should be scratched and pushed to the thigh and then returned to the arm.

The advantage of freestyle is clearly that it is fast. Freestyle is the fastest and most effective stroke, and it is also the fastest stroke in competitive competitions, and it is also the favorite stroke of long-distance swimmers in recent years. Freestyle can achieve the minimum physical consumption for long-distance swimming.

The disadvantage of freestyle is that the face must be underwater for a long time and vertically downward, which requires turning your head when breathing. The coordination of breathing and body swimming in freestyle makes it one of the more difficult swimming postures to master.

butterfly stroke


Butterfly stroke is the most beautiful and difficult stroke among the four strokes. Butterfly stroke requires the body to do wave-like movements like dolphins, that is, whip the whole body. The underwater movement of the arm is actually similar to the front of freestyle, except that the hands are synchronized, and the water is thrown in front of the water after being pulled under the hips.

The advantage of butterfly stroke is that it is fast. Apart from freestyle, butterfly stroke is a relatively fast stroke, which is faster than breaststroke and backstroke. Another advantage is that it looks good and fun because of its unique dolphin-like body fluctuation.

However, one disadvantage of butterfly stroke is that it consumes too much and is not suitable for long-distance swimming. Another disadvantage is that it is not easy to learn, because butterfly stroke requires difficult body wave movements and the timing of arm ejection is not easy to grasp.

The technical advantages and disadvantages of the four strokes are briefly analyzed, which helps beginners to understand swimming and enhance their curiosity, and also helps swimmers to learn more about swimming. Help all people who love swimming to explain the problems encountered in swimming.

China beauty cosmetics won’t give in easily.

Title map | vision china

Three years after the epidemic, it seems that the economy and consumption have been slowly drawn out. How many people will wear full makeup when they go out now?

According to the latest data released by the National Bureau of Statistics, the total retail sales of cosmetics in March 2022 was 34.5 billion yuan, down 6.3% year-on-year, which was the first decline in two years. Waves come between the ripples, and the signs of industry change can be seen from these data.

In it, China’s beauty brand has also sung all the way to a difficult step, and after a sharp rise and fall, it has come to a difficult turning zone:The whole industry has entered a period of deep ploughing, and it is urgent to find a new growth engine after the traffic dividend disappears.

But for enterprises, the transformation under the headwind of the industry has always been a life-and-death test.

Even Yixian E-commerce, which achieved the listing myth in four years by virtue of the perfect diary of "Light of Domestic Products", has become a shackle now. If it cannot establish a higher barrier for its own products and brands, its road to rise will reach its peak.

So,The key question now is, where will the tide of the beauty industry flow? Can the perfect diaries follow the trend and be reborn, and then get the favor of capital?

The direction of the tide

Tides also have cycles. If you want to understand the challenges of domestic beauty products more deeply, maybe you can look back a little.

Around 2000, a batch of "Made in China" appeared in China’s daily chemical industry, which seems to be a big brand today: "Vitality 28", "Little Nurse" and "Ding Jiayi" … Now these forgotten names have also sprung up, even if they compete with international big brands, they have never fallen behind.

But in the end, most of them failed, and the reasons are very complicated. First, under the epidemic, beauty cosmetics, as a non-mandatory consumption, are weaker as a whole; Second, consumers are more picky and the traffic is getting more and more expensive; Third, the industry supervision policy has become stricter; Fourth, the business strategy failed to be adjusted in time, and the living space was squeezed by the acquisition of Xuecang.

But even if the market is cold, China’s beauty industry still has huge imagination:

In 2021, the Food and Drug Administration officially announced that China had become the second largest cosmetics consumption market in the world, which took only 20 years. With the increase of per capita disposable income and the improvement of consumption concept, the beauty market has not yet reached the ceiling. From the subdivision of the track, skin care products are more needed and the ceiling is higher.

If we benchmark overseas markets, the per capita consumption of cosmetics in China will be less than 50 US dollars in 2019, and the markets in Europe, America, Japan and South Korea will be 5-7 times that of ours, which shows that the demand has not been fully released. But from the perspective of competition pattern,International brands still dominate the high-end beauty market in China, while domestic products are dormant in the mass market. In the era of the rise of the national tide, there is hope to run out of domestic beauty brands that can compete with international giants in the future.

There is room for development,How do domestic beauty brands find and install the next round of growth engines?

Judging from the growth path of global beauty brands that have been deposited for a hundred years, product strength and brand strength are undoubtedly the two core competencies that can lead by far. This clearly shows that beauty brands must have strong R&D strength in order to provide products with more powerful and targeted functions.

For a time,The strategic layout of brand power and crossing cycle has become the focus of beauty industry.New domestic products have also tried the water.

For example, Yixian e-commerce has launched a triple transformation. But many years ago, "Made in China" failed to cross the threshold. Can today’s new domestic products solve it?

Fight change with change.

Let’s focus on Yixian e-commerce, a beauty brand that has reached the level of ten-year revenue of some domestic brands in three years. It develops products by integrating the world’s top supply chain, gains the recognition of users with the quality of comparable brands, and superimposes the accurate grasp of traffic dividends, so that its repurchase rate, conversion rate and positive word-of-mouth continue to rise, thus grabbing market share faster.

However, with the gradual fading of the channel dividend and the impact of the epidemic, the overall growth of the beauty industry slowed down, and Yixian e-commerce also experienced an "unwell" reaction-in 2021, it achieved an operating income of 5.84 billion yuan, an increase of 11.6% year-on-year, and the growth rate slowed down. But in fact,Yixian e-commerce is also one of the few beauty companies in the industry to achieve positive growth in performance.

When the environment is different, the market competition intensifies and the traffic platform matures gradually, and now there are fewer and fewer "traffic depressions". Compared with competing for traffic, the key element of future competition is hard power in all aspects. Therefore, beauty companies began to enter the stage of refined operation 2.0, from "impulse" to "quality improvement".

Yixian e-commerce has also opened a new model of "hematopoiesis", and the first step is the transformation of "reducing blood fat and increasing muscle".This has also brought it higher operational efficiency and improved profitability:

In 2021, the operating expenses of Yixian e-commerce totaled 5.523 billion yuan, down 8.67% year-on-year; Sales gross profit margin increased by 2.5 percentage points year-on-year to 66.8%; Net loss narrowed by 42.5% year-on-year.

butThe key is still in the second step: creating a new growth curve.

Internet gives new domestic products the opportunity to become "online celebrity", but it also reduces the possibility of them becoming "Changhong" brands. Yixian e-commerce is lucky, and Perfect Diary is its first brand to enter the mature stage; However, referring to the development history of those international beauty giants, we must establish our own multi-brand matrix to maintain lasting vitality.

The first direction of attack is definitely the new growth point of China’s beauty industry-mid-to-high-end beauty market. According to the data of Huajing Industrial Research Institute, the proportion of mid-to high-end beauty market in 2020 and 2021 was 24.8% and 26.3% respectively, and the growth rate was significantly higher than that of mass beauty market. It can be seen that the trend of consumption upgrading is also applicable to the beauty industry.

Yixian E-commerce has also laid out two high-end skin care brands, EVE LOM and French Kelanli, and achieved initial results: during the double 11 in 2021, EVE LOM sold for two hours, which exceeded the total sales of double 11 in 2020; Kelanli broke the international record of Tmall and became one of the fastest growing high-end skin care brands in 2021.

Thanks to this, Yixian e-commerce skin care sector achieved rapid growth. In 2021, the income of skin care brands grew rapidly, and GMV reached nearly 1 billion yuan, up 332% year-on-year, accounting for 14.6% of the total revenue, which has become the second growth curve.

In addition,Beauty and skin care have also set off a "component party" craze. This young people are keen to explore whether the product ingredients are scientific and pursue a healthier and more effective way to become beautiful.Yixian e-commerce also launched a targeted brand: DR.WU Darfu, who positioned the brand of "Doctor Specialized Research". As long as you have a little understanding of "brush acid" and "Early C and Late A", almost no one knows its ace single product almond acid essence; Everyone’s yearning for eggshell muscle also helped it become the first acid product of Tmall double 11.

Yixian E-commerce also independently hatched the skin care brand Wanzi Xinxuan and launched the independent beauty brand Pink Bear, thus building a matrix with eight brands, including Perfect Diary, Little Odin, Wanzi Xinxuan, Galénic French Colanli, DR.WU (Chinese mainland business), EVE LOM, Pikoan and Yi ‘an State, and initially forming a coverage of all categories and full price bands.

If the brand matrix is still an iceberg on the water, then talents, R&D and infrastructure are huge bases under the water.

Judging from the 2021 annual report of Yixian E-commerce, it is actively investing in these "three major assets".

In terms of research and development, Yixian e-commerce invested 142 million yuan in real money in 2021, up 113.6% year-on-year, and the R&D expense ratio reached 2.43%; Its R&D investment level has been in the first echelon of domestic beauty listed companies. Up to now, Yixian e-commerce has 118 patents worldwide, and the number of patents has increased by 71% year-on-year, including 39 invention patents (some of which are in the process of transfer).

Yixian e-commerce also actively uses external forces to integrate global resources through Open Lab open R&D system.Its cooperation not only includes well-known research institutions at home and abroad, such as the Institute of Chemistry of the Chinese Academy of Sciences, the National Nano-drug Engineering Technology Research Center of Huazhong University of Science and Technology, and the 3D Skin Research Institute of the University of Lyon, France; It also includes related upstream and downstream, such as Shanghai Ruijin Hospital, Kosmeishi, Yingteli, etc., in order to jointly solve the problem of beauty research.

It can be seen that Yixian e-commerce turned"technical beauty cosmetics"With great determination, it also has enough liquidity and flexibility to achieve strategic goals (by the end of 2021, its book capital totaled 3.14 billion yuan); It’s just that this return may be nonlinear, but can today’s capital market be patient?

Enter a new value cycle

Yixian e-commerce used to be the "darling of capital", whether it was multiple rounds of financing in the process of growth, or ultra-fast completion of listing, or the market value soared from 100 million US dollars to 16 billion US dollars in February 2021.

However, after that, influenced by the double factors of the inner ring, the performance of Yixian e-commerce capital market is hardly optimistic, and its share price has seriously deviated from its intrinsic value.

External factors include the end of the channel dividend period, the constant pressure on the share price of the beauty sector caused by repeated epidemics, and the constant turmoil of the China Stock Exchange policy and the valuation killing caused by geopolitical conflicts. Internal factors mainly mean that Yixian e-commerce is in a strategic transition period, and now it focuses more on reducing costs and increasing efficiency and realizing profitability. These measures will also make sales fluctuate within a certain period of time.

For this reason, Yixian E-commerce received a delisting warning from new york Stock Exchange. Although this is a normal regulatory risk warning of NYSE, it does not mean that the enterprise is in the delisting stage, and Yixian E-commerce can completely raise its share price by means of repurchase and "share reduction" in the next six months to avoid delisting risk, but in the end, it depends on the effectiveness of its transformation to regain the favor of the capital market.

However, there is no precedent for the reversal of difficulties in China Stock Exchange.

Weilai, one of the top three domestic new electric forces, once fell to the red line of delisting in 2019, but by the end of the year, Weilai’s sales had grown against the trend and won the sales champion of new car-making forces for two consecutive months.The core is inseparable from the user’s belief in its product strength.

Inconvenient charging and long charging time are another obstacle to the use of electric vehicles after the anxiety of continuing navigation and battery safety problems. However, Weilai’s power exchange mode has solved the pain points in the market and brought confidence to electric vehicle users.

Many car owners have great expectations for the popularity of Weilai 100-degree battery and power exchange station. In their eyes, Weilai can solve the problem of users’ energy replenishment, at least at high speed, without considering the problem of running without electricity.

It is because of product strength that word-of-mouth comes out of the circle that Weilai’s sales can return to the growth track (Q4 still delivered more than 8,000 vehicles in 2019).

Visible,Product strength and brand strength are the basis for these new domestic products to enhance their fundamental performance and ultimately faithful wife.

This is also what Yixian e-commerce is practicing.

From the perspective of pure capital market, for beauty companies, the driving force of valuation switching usually comes from the continuous growth of existing brands, the marginal contribution of new brands, and the β -type development opportunities brought about by the tightening of supervision, accelerating the clearing of small and medium-sized enterprises, channel change and the rise of national tide.

What can be expected is that research institutions generally predict that the growth rate of cosmetics industry will show a trend of low before and high after this year, and the industry beta market is expected to be realized in the second half of the year; In the long run, the cosmetics industry is still a good track for "long slopes and thick snow". In the end, the new local beauty forces with strong brand matrix and group development potential will have greater investment value.

It is easy to break the circle, but difficult to grow red. Only by doing difficult and valuable things can perfect diaries truly usher in the next golden five years.

Related skills of playing badminton well

This content comes from @ What is worth buying APP, and the opinions only represent the author himself | Author: Where the dust floats,

The first part learned the basic knowledge of badminton. Let’s continue to discuss and learn the related techniques of playing badminton well.

1. Hold the racket
The key to playing badminton is to hold the racket. Everyone’s hands are different in size, but try to divide them into two parts. Hold the racket with middle finger, ring finger, little finger and palm. Flexible use of index finger and thumb.

First, it is used for forehand and backhand conversion; The second is the support point for swinging the racket. Usually the forehand fulcrum is the thumb and the backhand fulcrum is the index finger. The following is a schematic diagram. Focus on the position of the index finger.

Forehand grip

Backhand grip

2. Wrist

When you play ball, whether it is forehand grip or backhand grip, you should rely on your wrist to lead the racket left and right, then twist the racket back to the position of your fist and mobilize your whole body to serve the ball.

3. Hit the ball

Badminton can be hit because of the inertia force of the racket. Badminton is the best only when the beat turns positive, so that the ball hit will be free. Therefore, it is necessary to adjust the row surface in time and grasp the timing of hitting.

strike a ball

4, footwork

Footwork is also very important in badminton. Keep in mind that a consciousness is to have a low center of gravity. Because basically every stroke is made with the right foot striding forward, it is necessary to develop that when striding, the toes turn outward and the right heel touches the ground first, which can effectively and quickly attack or return to defense.

pace

After mastering these skills, you can improve your badminton skills, and you won’t be very bad in your daily activities. Of course, we must continue to practice and adjust in the later period to find a way that suits us.

Of course, there are still many requirements to achieve professional standards. . . Give professional things to professional people to do. As non-professionals, we should master the basic skills and do more exercise.

The author declares that there is no interest in this article, and welcomes rational exchange and harmonious discussion among value friends ~

Speed does not lose high-speed rail! How does badminton, the king of ball speed, fly?

Speaking of badminton, I think everyone is familiar with it. Even if you are not a badminton fan, you will often see players in various sports venues or squares, and you will be right.Lindane, Li Zongwei.When famous players hear about it.


However, even fans who often play ball may not have noticed it.Details of badminton flight.

Why is badminton designed like this? Does it always fly with its heavy ball head facing forward? How far can badminton fly? Does it spin when it flies?Presumably these questions have aroused everyone’s curiosity, so let’s walk into the text together ~

Part 1: Flip of Badminton

Anyone who has played badminton will notice a phenomenon, that is, when the ball flies towards you, it is almost always.Ball head in frontThe gesture. Put yourself in the other’s shoes, and your opponent will certainly see the same phenomenon. Then there is only one possibility, that isAfter each side hits the ball, badminton will turn over.Then turn around and fly back. The question is, is the U-turn completed at the moment of hitting the ball? Maybe we take it for granted.

Fig. 1 (a) a snapshot with an initial velocity of about 18.6 m/s and an initial angular velocity of about 206 rad/s (with an interval of 5 ms); (b) Snapshots with an initial velocity of about 10.4 m/s and an initial angular velocity of about 28 rad/s (interval of 6.5ms). | The picture is from the literature [1]

Unfortunately, the answer is not like this. As shown in the above picture, the moment of hitting the ball is basically atAbout 1msIt’s done, but it’s usuallyAbout 20msThe ball can be turned over. And then go through itDamping oscillationIn order to make its ball head point in the direction of speed. In order to show this process more intuitively, we draw the relationship between the ball head pointing and the speed direction in Figure 2.Angle φEvolution over time. amongτ, τ and τThey respectively represent the time from the first turning to the ball head facing forward, the damping oscillation time and the characteristic time to reach stability.

Fig. 2 Evolution of included angle in two cases. | The picture is from the literature [1]

It can be seen that after 0.1-0.15s, badminton seems to have a forward posture, so except for some special hitting situations, weIt is difficult to capture with the naked eye.The process of rapid turnover adjustment of badminton after hitting the ball. So … Does this flip behavior of badminton have anything to do with its own structure?

Fig. 3 Force analysis of badminton when traveling | The picture is from the literature [1]

The answer is yes. Badminton byCork ball head and skirt structure made of goose feather/duck feather or plastic.Composition, in which the ball head is heavier and the skirt structure has a larger cross-sectional area. We might as well abstract this feature as identified by B and C in the figure.Large mass and large cross-sectional areaSkirt area andSmall mass and small cross-sectional areaThe ball head area of.

When flying, assuming that the direction of the ball head is not consistent with the direction of the speed, and there is an included angle φ, the air resistance acting on B and C will generate a moment with the center of mass G as the reference point respectively. On the one hand, the skirt structure has a large cross-sectional area and air resistance.FBigger, on the other hand, BG is longer than GC, so the ball will inevitablyRotate counterclockwise around the center of mass until the ball head points in the direction of speed..

Figure 4 Badminton shape schematic. | The picture is from the literature [1]

If the above weight distribution is easy to think of, then aboutWhy did badminton choose an opening angle close to 45?Perhaps few people have thought about it. In fact, this is closely related to whether badminton can experience flipping and achieve stability faster. Some scholars have recreated the shape and mass distribution characteristics of badminton with small iron balls and skirt structures made of plastic, and released it freely in the way of skirt structure facing down in water, so that it can turn over during sinking, as shown in the following figure.How does its opening angle affect the turnover and stabilization time?.

Fig. 5 How the opening angle affects the turnover and stabilization time. | The picture is from the literature [1]

Visible, opening angle is too small and too big is not conducive to the stability of the flip, and fromThe range of 30 to 90.Will experience a stable and fast platform area. Obviously, the opening angle of badminton falls in this area.

Part 2: the flight path of badminton

Different from tennis, badminton’s flight trajectory is greatly influenced by air resistance because of its light weight.Seriously deviate from the shape of parabola. Generally speaking, the equation of motion followed by badminton flight can be written.

Among them, and are the mass, density and cross-sectional area of badminton, respectively, and the speed,UandgIs the vector of velocity and acceleration of gravity, and is a constant related to the test conditions. It is not difficult to understand that in addition to the gravity term that makes it do oblique throwing, the ball will also receiveResistance whose magnitude is proportional to the square of velocity and whose direction is opposite to velocity.. And the specific trajectory is made up ofSize and direction of initial velocityDecide. For badminton, we can define a quantity related to its flight characteristics, which is called pneumatic length.

For the badminton we use, this distance is about 4.6m, which determines that the final stable speed of the badminton is U=6.7m/s when it falls freely and vertically. In the picture below, we can see the flight trajectory of badminton at different initial speeds.Comparison between calculated value (solid line) and actual value (scattered point)It can be seen that the motion equation can predict its trajectory well.

Fig. 6 Comparison between the calculated value and the actual value of badminton trajectory with different initial speeds. | The picture is from the literature [1]

So how far can badminton fly? We might as well look at the changing trend of the distance X traveled by badminton when it falls to the same height as the starting height after approximately throwing. According to the above equation of motion, we can find that this distance depends on the initial speed of badminton. willFlight distancexOn the relationship between initial velocity elevation angle θ and velocity magnitude uDrawing, you can get the following results.

Fig. 7 Variation of travel distance (m) with initial speed direction (elevation angle) and speed.

As long as you have played badminton, this picture must contain some information points that you can empathize with. For example, we find that no matter how hard we use, it seems that badminton always flies."come to an abrupt end" near a certain distance. The upper speed limit in this picture has been reached.140m/sHowever, the farthest distance that can be reached is only 13.83m. And the badminton court we use13.4m longThat’s why badminton can only hit the opponent’s backcourt from one side even if it tries its best, and it won’t play much even if it is out of bounds.

Fig. 8 Schematic diagram of badminton court

Some readers may ask, is it too exaggerated to set the upper speed limit to 140m/s? Can badminton fly so fast? In fact, it is not an exaggeration. In July 2013, Chen Wenhong, a Malaysian men’s doubles player, killed the ball under the ideal conditions in the laboratory.493km/hThe amazing speed is equivalent to136.9m/s. There are also reports that Danish player Codin has played.506km/hKill the ball record, namely140.6m/s. Even in the game, Codin played.426km/hSuper fast kill ball. thereforeBadminton is the deserved king of ball speed!

Fig. 9 The ultra-fast kill of Keding 426 km/h.

In fact, the flight trajectory of badminton is also related toType of ballRelated. We usually have two kinds of balls made of feathers and plastic. The following figure shows the difference of their flight paths.

Fig. 10 Trajectory comparison between feather ball and plastic ball. | The picture is from the literature [1]

On the one hand, with the same initial angle and speed,The reachable range of plastic ball making is larger than that of feather ball making.; On the other hand, feathering is near the highest point of flight.Greater curvature, trajectoryCloser to the "triangle".

Figure 11 Plastic balls


This is because under the condition of ensuring firmness and low cost,Plastic ball making tends to be biased.. This also means that feathering can be done without going out of bounds.Fly at a faster speed, thus reducing the opponent’s reaction time. Therefore, feather ball making is often more popular.

Part 3: the rotation of badminton

You may have noticed that badminton feathers areArranged obliquely in the same clockwise directionYes. Is this an irrelevant design? Actually, it is not. We can think of each feather as a thin plate, which will be subjected to when traveling in the fluid.The direction is perpendicular to the plane and opposite to the speed direction.The force, as shown in the figure below.

Fig. 12 Stress diagram of feather | The picture is from reference [1]


We immediately think that the resultant force of these forcesWill make the whole badminton rotate around the axis!When badminton travels at a faster speed, the greater the resistance, the greater the torque generated by the resultant force, which makes badmintonFaster rotation. If we multiply the angular velocity ω by the axial radius r of the feather to get the linear velocity at the feather, we will find that it is almost the same as the traveling speed.Linear relationship.

Fig. 13 Relationship between badminton rotational linear speed and traveling speed | The picture is from the literature [1]

Moreover, compared with plastic balls,The rotation speed of feather ball is obviously faster in flight.. The analysis shows that faster rotation will limit the precession of feather pelletizing, whichConducive to the stability of feathering in flight..

It seems that the flight details of badminton are really a university question. In this process, we can not only learn a lot.Physical knowledge, but also help to understand the ball.Flight path. After watching the push, the little friends quickly pick up the racket and see if the skills are improving ~

References:

[1] Cohen C, Texier B D, Quéré D, et al. The physics of badminton[J]. New Journal of Physics, 2015, 17(6): 063001.

[2] Badminton (Ball)-Wikipedia

[3] Kwan M W. It’sa Birdie… It’sa Shuttlecock… It’s Badminton: The Physics Behind the Badminton Shuttlecock[J].

[4] The world record of killing balls has reached a new high!


Editor: clouds open and leaves fall

"How many flowers did you earn today?" Why is domestic beauty more and more expensive? | Business Micro-Historical Records

Recently, Li Jiaqi’s inappropriate words in a live webcast caused widespread controversy, which made him and his co-brand Hua Xizi questioned. According to the statistics of bloggers in Little Red Book, Hua Xizi’s eyebrow pencil is priced at 79 yuan, with a content of only 0.07, and the price per gram is higher than that of gold. Why do you think that "cheap and big bowl" domestic beauty products are becoming more and more expensive? How to strike a balance between "self-help" and "price increase" for domestic beauty cosmetics?

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Table tennis Portugal tournament ends! Japan was wiped out, Guoping won three championships, and the men’s team was defeated.

In the Portuguese table tennis match in 2023, the audience witnessed a fierce confrontation and technical contest. This competition is not only a test of athletes’ skills, but also a test of their psychological resilience. In this competition, the confrontation between the Japanese team and the China Table Tennis Team is particularly eye-catching, and both teams have demonstrated a high level of competitive state and adaptability.

First of all, it should be pointed out that the China table tennis men’s team suffered a rare rout in this competition. This result undoubtedly shocked many table tennis fans and experts. China’s men’s team, which is usually known for its stability and strength, seems to be unable to cope with the Japanese team. On the other hand, the Japanese team showed a rare unity and fighting spirit, and they showed excellent performance and were full of strategy in the game.

By analyzing the competition process, it can be found that psychological factors played an important role in this competition, except for the similar strength of the two teams in the technical level. China players are a little nervous and insecure at the critical moment, while Japanese players seem to be more adaptable to the stressful environment and can better control the rhythm and mood of the game. This difference in psychological preparation may explain why the Japanese team can completely suppress the China team.

Next, it is worth noting that table tennis, as a sport with extremely fast speed, requires extremely high concentration and reaction speed, and puts forward extremely high requirements for athletes at the spiritual level. Keeping concentration and adjusting strategy are the key to winning, and this is where the Japanese players performed well this time.

Nevertheless, we can’t just focus on the results when evaluating the game. Failure is also the only way for growth and progress. Although the China table tennis men’s team failed to get what they wanted, their fighting spirit and efforts are still worthy of recognition and respect. Similarly, the victory of Japanese players also proves their determination to constantly improve and break through themselves.

Looking back on the whole Portuguese table tennis competition, while analyzing the technical details and strategic layout of the competition, the inner world of the athletes is equally important. Sports competition is not only a physical contest, but also involves many aspects such as will, emotion and psychological quality.

To sum up, in the report shared by the gentle ship SvE publishing platform to the readers, we see a panoramic and in-depth analysis of the 2023 Portuguese table tennis competition. This paper objectively analyzes various complicated factors in the fierce competition between two representative groups-Japanese team and China table tennis team, and especially emphasizes the important position of psychological level in high-level competitive sports.


Finally, it reaches the emotional resonance point in expressing respect and encouragement to the contestants regardless of success or failure. Everyone in the sports field deserves admiration: the losers are tenacious and brave for it; Successful people are inspired by their outstanding achievements. Through such in-depth reports and reflections, we have more realized that the sports spirit transcends the simple binary opposition between victory and defeat, and passed on this spirit of persisting in pursuing Excellence and never giving up.