Over evolutionary time, they lose unnecessary genes and become streamlined, ultimately leaving them with a tiny fraction of the genes they started out with: only the ones they really need.
在进化的时候，它们失去了不必要的基因，变得精简，最终留下了它们基因原始的一小部分：只有那些它们真正需要的。
Over evolutionary time, they lose unnecessary genes and become streamlined, ultimately leaving them with a tiny fraction of the genes they started out with: only the ones they really need.
在进化的时候，它们失去了不必要的基因，变得精简，最终留下了它们基因原始的一小部分：只有那些它们真正需要的。
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