我女儿在体校接受网球训练已有近三年，练的一直是关闭式底线击球，但在我观看的国际比赛中发现世界高手们都是用开放式正手击球的，请问这两者各有什么优缺点？答：正拍关闭式步法的优点在于容易完成侧身转体带动的后摆动作，因为只有充分的后摆动作才能有力地击球。另外... My daughter has been practicing tennis for nearly three years at the gym and has practically been shutting down the bottom line. However, in the international competition I watched, the world masters used the open forehand to hit the ball. What are the advantages and disadvantages of each? A: The advantage of taking a close-up step is that it is easy to carry out the swinging action of the side-swinging swivel, because only the full back-swinging action can effectively hit the ball. In addition ...