When a tennis ball stays on your strings for 4/1000 of a second it is impossible to do this.

当网球在你的拍线上停留4/1000秒的情况下这是不可能做到的。

youdao

When a tennis ball stays on your strings for 4/1000 of a second it is impossible to do this.

当网球在你的拍线上停留4/1000秒的情况下这是不可能做到的。

youdao