以下为句子列表：
英文: A good drill is to let the non-hitting hand which is riding on the throat of the racquet drop and touch the back thigh.
中文: 好的训练是要让非打击的手,它正乘坐在网拍喉部,落下并碰触后面的大腿。
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英文: A high sweet spot, i.e. a center of percussion close to the tip of the racquet is good because it means low Impact Force.
中文: 甜点在这条轴线上的位置越高（离手越远，离拍头越近），就越好。
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英文: After the ball leaves, the racquet mass center (balance point) moves at a slower speed, and this means a loss of its kinetic energy (kinetic energy = 1/2 mass times velocity squared).
中文: 球离开之后，球拍开始减速，球拍减速的过程就是能量释放的过程，释放能量的值等于?（球拍）质量乘以速度的平方。
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英文: Also, use the non-hitting hand to help get the racquet down below the contact point before swinging forward.
中文: 同时,使用非打击的手帮助网拍在向前挥拍之前能降低到低于接触点。
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英文: Also, use your non-hitting hand to help you get the racquet low enough.
中文: 同时,使用你的非打击的手帮助你把网拍弄够低。
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