这些用手腕和前臂调整难以一致地如此作。
These adjustments with the wrist and forearm are difficult to do consistently.
从这点，没有需要要卷动手腕和前臂，球就去了。
From this point there is no need to roll the wrist and forearm, the ball is gone.
手腕和前臂：向前伸出手臂，然后，手腕朝上弯曲。
Wrists and forearms: Extend them and bend your hands back at the wrist.
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