为了保持在水中不至于沉底,尾部的顶端比底端向后延伸,沿着后端形成一个斜面,产生提力。
To help generate lift to keep midwater, the top of the tail extends farther back than the bottom, creating a slant along the back edge.
带着这个掉下海会直接沉底的。
我们沉底了,罗杰斯心里想。
This sperm has gained quite a vocabulary, and it includes this line: "I have seen the best swimmers of my generation go under.
这个精子词汇量很大啊,它总结如下:,我曾见过这代人中最好的泳者沉底。
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