Sea butterfly: a swimming predatory Marine sea snail. They have two wing-like outgrowths (lower right) derived from their foot, which they continually flap to swim through the water.
海蝴蝶：一只正在游动的食肉性海蜗牛。它们拥有像翅膀一样的由足进化而来的侧翼(位于右下方)，并靠拍打侧翼在水中前行。
One day later, the researchers induced stress in the rats through a commonly practiced technique—placing them in a bucket of water in which they had to swim.
第二天，研究人员通过一种通用的技巧来诱导老鼠的应激，也就是把它们放在一个水桶里，在这个水桶当中老鼠为了求生必须游泳。
In open water the ability to swim at a higher stroke rate is a huge advantage as it helps you punch through wave and chop created by other swimmers.
在公开水域高划频是一个巨大的优势，它能帮助你在其他选手造成的波浪中迅速通过。
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