He put a lot more topspin on his backhand.
他在反手打出了更多上旋。
I am good at the backhand topspin.
我擅长反手上旋球。
A professional tennis player just "knows" how to return a ball with a topspin.
一个专业的网球选手“知道”如何回一个上旋球。
Solution a: Remember, it's impossible to impart topspin without a low to high swing.
解决方案A：记得，没有由低到高的挥拍要授予上旋球是不可能的。
Solution a: Remember, it's impossible to impart topspin without a low to high swing.
解决方案A：记得，没有由低到高的挥拍要授予上旋球是不可能的。
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