You may start to notice an underwater wave that brushes your knees while doing the dolphin kick.
你会注意到一个水下波刷你的膝盖，当我在海豚式打腿。
The dolphin kick and body undulation exercises simply teach you how to learn the technique described above.
海豚式打腿练习和身体的波动只是教你怎么学技术前述。
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。
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