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As shown in Figure 1, let's first talk about the topspin ball. The ball rotates counterclockwise, driving the air around the ball to form an airflow with a speed of v1; the ball moves forward, and the air has a backward airflow with a speed of v2 relative to the ball.
Don’t think that you know everything if you play well. You may not know these things (1)
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1417
Hsieh Chang-ting (left), the "representative of the Taiwan authorities in Japan", and Yang Hui-ru (right), the "card god".
The card god "Taiwan authorities' bestie group" has direct access to Su Jiaquan and Guan Biling
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A new way to choose a vacuum cleaner: BOSCH GAS 18V-LI handheld vacuum cleaner. I have been looking at vacuum cleaners in my aunt, and I have read a lot of Dyson’s sales and experiences. I have been thinking about it for a long time, but the price is really unaffordable, so I hav
An alternative vacuum cleaner choice: BOSCH GAS 18V-LI handheld vacuum cleaner
06/14
1192
On July 5, the news that two teenagers drowned and disappeared after several teenagers were playing in the river in Taizhou, Jiangsu Province touched people's hearts. According to a previous report by Jimu News, "It is reported on the Internet that 2 teenagers drowned in the Yang
Two teenagers drowned in the Yangtze River in Taizhou, Jiangsu Province and disappeared. Villagers: The bodies have been salvaged ashore
06/14
1792
▲Now is the lavender season. (Picture/reproduced from the Lavender Forest fan page, the following are the same) Tourism Center/Comprehensive Report The weather is getting colder day by day, and the cherry blossom season has begun in various parts of Taiwan, and the romantic purpl
Mountains of purple romance! Lavender forest bloom season begins, limited desserts are super tempting
06/14
1465
On the afternoon of June 1, in the waters of the Liujiang River near Gutingshan Development Zone and Yuan Road in Liuzhou City, search and rescue boats from the public security, fire and other departments were searching and rescuing on the river. It is understood that in the afte
Worrying things still happened! Three boys were playing in the water in Liujiang River, and one of them fell into the water and disappeared.
06/14
1072
For dessert lovers in winter, the classic strawberry must be paired with the unbeatable waffle dessert. Whether it is an ordinary thin waffle or a fluffy thick waffle soufflé, it is a classic and perfect combination. The following are the dreamy delicacies. Introducing four limit
Super popular strawberry soufflé! Four limited edition waffles and desserts that are a must-try for those who love them
06/14
1957
[Inscription] The most taboo thing for readers is to establish one idea first, insert crimes everywhere, and destroy hundreds with one move. However, the sage's wise and vast meaning is hidden.
Liu Fangsheng: Chuanshan’s land thought and its modern significance
06/14
1473
The children innocently said: I wish my grandparents and grandparents a long life; my parents said happily: My parents are old, and a healthy body is the first prerequisite for them to live a good life; my parents leaned on the bedside and muttered to themselves. : Why are you li
"The Art of Diet" that is popular in Japan: I can still be self-reliant and age gracefully even when I am 100 years old
06/14
1747
"If you can't stop the war, tell the world the truth about it." Our party and our army have been accompanied by the flames of war since the day they were founded, and there is a group of "news warriors" who shuttle among the hail of bullets.
The soul-stirring war memories of the older generation of war correspondents
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1301
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On June 16, a freshman girl from China Pharmaceutical University suddenly drowned and died while taking a swimming test organized by the school. In the past two days, some netizens posted
A first-year girl drowned in swimming exam, China Pharmaceutical University responded
06/14
1405
Taiwanese media said that due to the incident of Chiang Kai-shek's coffin in Cihu, Taoyuan on February 28 this year, paint was thrown on the coffin of the "independence faction", so in order to avoid retaliation. The investigation team of Taiwan's Xindian Police Station will arra
Taiwan media: Fearing "retaliation", Taiwanese authorities deployed police to guard Tsai Ing-wen's father's cemetery
06/14
1813
The "Reserve Command" of Taiwan's defense department was reorganized into the Army Headquarters and served as the supervisor of mobilization troops. The Northern, Central and Southern Regional Reserve Commands and the County and City Reserve Commands were reorganized into various
Taiwan’s defense department will establish a “Defense Reserve Mobilization Agency” under the Army Command
06/14
1291
Source: Overseas Network Taiwan Military [Overseas Network April 14th | All-time zone for fighting against the epidemic] The Taiwan Democratic Progressive Party authorities have recently donated masks on a large scale, but the amount of masks from all walks of life on the island
Taiwanese military officers and soldiers are angry: The DPP authorities donated masks in large quantities, but the soldiers could not receive them
06/14
1773
Xiao Tianliu, a retired major general of the Taiwan Army and former director of the Procurement Management Division of the Armaments Administration, said in an interview with China Review News that that was an ideal state for mobilization, but in fact, the military did not pay en
Taiwan's military said it could mobilize 450,000 people if a war started. Taiwan's retired general: Is there anyone who has no equipment and wants to carry a broom to fight?
06/14
1222
After being detained for 55 days, Taichung's "Coast Patrol" dispatched boat PP10031 at 10 a.m. on the 28th to drive the ship away and required the ship not to enter restricted waters for operations, otherwise the fine would be increased or even detained.
Taiwan authorities detained a mainland fishing boat for "crossing the border" and fined it 340,000 yuan before driving it away.
06/14
1821
Site Latest News
On June 16, a freshman girl from China Pharmaceutical University suddenly drowned and died while taking a swimming test organized by the school. In the past two days, some netizens posted
A first-year girl drowned in swimming exam, China Pharmaceutical University responded
06/14
1405
Taiwanese media said that due to the incident of Chiang Kai-shek's coffin in Cihu, Taoyuan on February 28 this year, paint was thrown on the coffin of the "independence faction", so in order to avoid retaliation. The investigation team of Taiwan's Xindian Police Station will arra
Taiwan media: Fearing "retaliation", Taiwanese authorities deployed police to guard Tsai Ing-wen's father's cemetery
06/14
1813
The "Reserve Command" of Taiwan's defense department was reorganized into the Army Headquarters and served as the supervisor of mobilization troops. The Northern, Central and Southern Regional Reserve Commands and the County and City Reserve Commands were reorganized into various
Taiwan’s defense department will establish a “Defense Reserve Mobilization Agency” under the Army Command
06/14
1291
Source: Overseas Network Taiwan Military [Overseas Network April 14th | All-time zone for fighting against the epidemic] The Taiwan Democratic Progressive Party authorities have recently donated masks on a large scale, but the amount of masks from all walks of life on the island
Taiwanese military officers and soldiers are angry: The DPP authorities donated masks in large quantities, but the soldiers could not receive them
06/14
1773
Xiao Tianliu, a retired major general of the Taiwan Army and former director of the Procurement Management Division of the Armaments Administration, said in an interview with China Review News that that was an ideal state for mobilization, but in fact, the military did not pay en
Taiwan's military said it could mobilize 450,000 people if a war started. Taiwan's retired general: Is there anyone who has no equipment and wants to carry a broom to fight?
06/14
1222
After being detained for 55 days, Taichung's "Coast Patrol" dispatched boat PP10031 at 10 a.m. on the 28th to drive the ship away and required the ship not to enter restricted waters for operations, otherwise the fine would be increased or even detained.
Taiwan authorities detained a mainland fishing boat for "crossing the border" and fined it 340,000 yuan before driving it away.
06/14
1821