但是一旦通过手腕调整好击球的方向后，击球的瞬间手腕都是固定的。
Otherwise you will take the risk of hurting your wrist very badly. The wrist should be fastened when you hit the ball.
尽量在发球时每次都把球抛到相同的位置，然后将球拍举到头后方，瞬间击球。
Try to toss the ball into the same spot every time? Let your racket head drop behind you and then hit the ball suddenly.
通过对击球瞬间挥拍速度与被击出的球飞出距离的关系进行了实验研究。
The relationship between the instant speed of swing during smash and the bounce distance of the ball hit were studied by experiment.
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