Professor Marshall said: "they are slow moving, efficient swimmers because they exist in a world where food is sparse and they need to conserve energy."
马歇尔教授说：“它们是行动缓慢且有效的游泳者，因为它们生活在食物稀缺的世界，需要保存能量。”
The flume was fixed to a speed of 1:40 /100m so no matter what, the swimmers had to maintain that speed, they couldn't slow down or speed up.
水槽的流速被固定在每100秒100米。这样无论水平怎样，游泳者都不得不保持这个速度，既不能快也不能慢。
The fastest swimmers are the ones who slow down the least.
游得最快的是哪些减速最小的。
The fastest swimmers are the ones who slow down the least.
游得最快的是哪些减速最小的。
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