In that video sequences of training speed swimming and drills are shown.

在那盘录象中，介绍了以训练速度和练习速度游泳时的几个片断。

youdao

In that video sequences of training speed swimming and drills are shown.

在那盘录象中，介绍了以训练速度和练习速度游泳时的几个片断。

youdao