When you go snorkeling by a school of fish, you will see every single one of those fish swimming along at the same speed.
当你在一群鱼旁边浮潜时，你会看到每一条鱼都以同样的速度游动。
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Or how about when you go snorkeling by a school of fish and you see every single one of those fish swimming along at the same speed, they keep the same distance from each other.