Solution: To impart underspin, you must swing high to low, but when players chop down too severely and finish low, their shot hits the net.

• 解决方案：为了要授予下旋球，你一定要由高到低挥拍,但是当球员太严重地劈砍下来而在低位完成收拍，他们的打击就挂网了。