蝶泳：一种泳姿。即采用俯卧姿势，双臂同时在水面之上前挥划水，结合身体做海豚式打水。
Butterfly: a stroke made in the prone position where both arms are lifted simultaneously out of the water and flung forward, in combination with the dolphin kick.
我尽最大努力去学习怎样保持漂浮，可是很奇怪我的头总是要沉到水面下去，就像跳水的那个姿势…晕！
I tried my best to learn how to remain suspended, but it was strange that my head always sank into the surface, which just like the posture of diving... faint!
他迅速地脱下脚蹼，摘下潜水面罩，用一只手拿着，另一只手费力地让身体保持站立姿势。
Slipping his dive fins from his feet and his mask from his face, he held them in one hand as he used his free hand to haul himself into a standing position.
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