... swimming: do the breast stroke 蛙泳 the butterfly stroke 蝶泳 the dolphin stroke 海豚式 ...
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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。
When you first start doing the butterfly stroke, you will find that it is a strength item.
初学蝶泳时，你会发现，蝶泳对体力的要求很高。
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。
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