1. The key is that the force of hitting the ball should pass through the center of gravity of the ball to make the ball fly out without rotation; 2. When hitting the ball, the wrist should be kept tight to form a hard plane, and the force should be concentrated quickly; 3. At the moment of hand hitting, the arm makes a rapid downward drag action, and the ball floats heavily or up and down; 4. The arm suddenly stops working, no
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