Remember, if the racquet face is closed at the low point of the backswing, it should be vertical at contact, provided you swing from the shoulder with a fixed forearm and wrist. 記得，如果網(wǎng)拍面在背后拉拍的低點(diǎn)是關(guān)閉的，它在接觸點(diǎn)應該是垂直的，假設你是固定前臂和手腕地從肩膀揮拍。
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