topspin

1.The moonball—a high, heavy topspin shot—drives lots of players crazy.

月亮球即又高又重的超级上球，这种球让很多球员抓狂。

2.And at the other end, lay one in short – and the point is over, Federer able to flatten it out, or lace it with topspin, the ball exceptionally heavy and often unreturnable.

另一方面，费德勒时常能一致命，这在于他能平球或者上球，球势格外的沉，令人难以回防。