dolphin kick

基本解释

Interstingly, the butterfly kick was developed separately, and is also known as the "dolphin kick".
有趣的是，蝶泳的踢水动作是单独发展出来的，而且被叫做“海豚踢”。
You can use a dolphin kick for either freestyle or butterfly, but for the start, remember to use a smaller, faster dolphin kick.
你可以在自由泳和蝶泳（入水后）打蝶泳腿，但在刚开始的时候，一定记住蝶泳腿要做到幅度小、速度快。
To swim butterfly correctly it is important to have mastered the body undulation and dolphin kick first before adding the arm movement.
游泳是很重要的蝴蝶正确掌握身体的海豚式打腿前、岩面起伏及其裸露程度增加臂的运动。