在反手发旋转球挥拍击球时，当球下降至腰腹处（击球点高，发球的弧线会高，击球点低，发球可能不过网），腰腹部用力带动手臂向前下方挥动，手腕加力，发球后，挥拍动作应尽可能停住，以利于还原。
In backhand spin serve, when the ball falls to the height of waist or abdomen (if the hitting point is high, the arc of the serve will be high; if the hitting point is low, the serve may not be over the net), the waist and abdomen forcefully drive the arm forward and downward, and the wrist adds force. After the serve, stop the swing to recover fast. 
A、正确
B、错误