A real fish can swim up to ten body lengths a second. The robot version clocks just one body length a second.
一条真鱼可以一秒钟游过十个身长的距离，而这种机器人还只能一秒钟游过一个身长。
When fish swim, they leave little swirling vortices in their wake. By swimming together in a school, they can transfer energy to one another through these vortices.
当鱼儿游动时，鱼尾会留下一个个小漩涡，当它们成群游动时，它们可以通过这些漩涡转换能量。
Then, with indescribable terror, he recognizes the fact that he is caught in a quicksand, and that he has beneath him that frightful medium in which neither man can walk nor fish can swim.
于是他变得无可名状地惊恐起来，意识到他已被围困在流沙之中，在他下面是人不能走、鱼不能游的恐怖地带。
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