"返祖"是个多义词，它可以指返祖（遗传现象）,返祖（书籍《返祖》）。
misc. throwback ; atavistic heredity
换句话说，鼹钝口螈的变态是一种返祖现象。
In other words, metamorphosis in mole salamanders is an atavism.
如果多洛定律是正确的，返祖现象应该很少发生。
If Dollo's law is right, atavisms should occur only very rarely.
进化返祖现象不仅有可能，有时还在进化的发展中扮演重要的角色。
Not only are evolutionary throwbacks possible, they sometimes play an important role in the forward march of evolution.
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