n.<网球>上旋;
例句:
The racquet face is a bit closed, so she'll generate some topspin.
她现在的拍面是闭合的, 因此她就可以加上点上旋.
This is the main reason everyone likes topspin.
这是每个人喜欢上旋的主要理由.
This is a natural motion and produces topspin on their shots.
这是一个自然的动作,并且能够在他们的回球上产生上旋.