The butterfly stroke had not accepted as a formal event until 1958.
蝶泳被列入正式比赛项目是在1958年。
A real important part of the butterfly stroke is the under water swimming, fly kick under water.
蝶泳非常重要的组成部分是水下部分，即水下蝶泳腿。
Butterfly is the only stroke I can't do.
只有蝶泳我不会。
When I teach any stroke, in particularly butterfly, I use the part method.
我在传授任何泳姿时都会将身体分为各个部分来讲解，教蝶泳时更是这样。
This is the feeling you're seeking on the initiation of each stroke of butterfly.
这是你正在寻找的感觉在每个冲程时的蝴蝶。
Swim butterfly, focusing your attention on this connection on the front of the stroke.
游泳蝴蝶，集中精力在这个连接在前面的行程。
I think butterfly stroke is the most difficult style to learn.
我想蝶泳是最难学的一种姿势吧。
You need to use your back muscles to swim the butterfly-stroke.
你必须用你背部的肌肉来游蝶泳。
You need to use your back muscles to swim the butterfly-stroke.
你必须用你背部的肌肉来游蝶泳。
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