That's called a butterfly stroke. Can you swim, Ruth?
那叫蝶泳。露丝，你会游泳吗?。
A: ok, Mom. Can I swim now? I want to learn butterfly stroke.
好的，妈妈，我现在能游了吗？我想学蝶泳。
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。
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。
Find your rhythm, then add a butterfly stroke... without breaking your rhythm.
找到你的节奏，然后再加上一只蝴蝶姿势…不打破你的节奏。
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。
Freestyle, butterfly, back stroke and breast stroke are four commonly seen strokes in swimming competition.
自由泳、蝶泳、仰泳和蛙泳是游泳比赛中常见的四种泳姿。
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。
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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