underwater butterfly kick 水下蝶泳打腿
We often refer the butterfly kick as the body dolphin.
我们通常把蝶泳踢腿称作海豚泳。
The butterfly kick is also known as the dolphin kick since it is similar to the movement of a dolphin tail.
蝶泳的打腿还有一个常见的俗名，即海豚踢。这是因为这种打腿方式和海豚尾巴的运动方式非常相似。
It is not permissible to take only a downward butterfly kick without then taking a normal breaststroke kick.
如果单施行一次向下蝶式踢腿，然后没有做一次正常蛙式踢腿，是不被允许的。
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