Then you can help her with breaststroke and sidestroke .

那在蛙泳和侧泳方面，你可以帮助她。

She swam a slow sidestroke up and down the pool .

她在泳池里缓慢地来回侧泳。

I prefer the breaststroke , though I can also do the sidestroke .

我会侧泳，但是我喜欢蛙泳。