1、A real important part of the butterfly stroke is the under water swimming, fly kick under water.
蝶泳非常重要的組成部分是水下部分，即水下蝶泳腿。

2、I am very good at swimming, for I can do butterfly stroke and backstroke.
而且，我認(rèn)為我游泳還是不錯的。而且能有的很好。我會蝶泳，仰泳。

3、The butterfly stroke had not accepted as a formal event until 1958
蝶泳被列入正式比賽項目是在1958年。

4、The butterfly stroke had not accepted as a formal event until 1958.
蝶泳被列入正式比賽項目是在1958年。

5、Two Chinese women swimmers have already entered the 100-metre butterfly stroke finals.
已經(jīng)有兩位中國女選手取得了100米蝶游的決賽權(quán)。