How do the back crawl swimmers see where they are going?

仰泳的选手如何知道他们前进的方向呢？

youdao

And that is my guide to back-crawl, have fun.

这就是我关于仰泳的指导，祝你们开心。

youdao

And that is my guide to back-crawl, have fun.

这就是我关于仰泳的指导，祝你们开心。

youdao