鸸鹋是一种大型的澳大利亚不会飞的鸟，类似于鸵鸟，但是有三趾的脚和灰色或棕色的羽毛。
Emu is a large Australian flightless bird, similar to the ostrich but with three-toed feet and grey or brown plumage.
例如，四趾的始祖鸟先于三趾的始祖鸟出现，但北美的化石证据表明，这两种动物之间有一个急促而不均衡的转换过程。
The four-toed Eohippus preceded the three-toed Miohippus, for example, but North American fossil evidence suggests a jerky, uneven transition between the two.
对控制多趾的相关基因及其分子机制进行研究，有利于我们深入了解多指（趾）畸形的形成机制，揭示肢体发育的过程和机理。
Study the genes of polydactyly and molecular mechanism can help us to know how limbs form and reveal the producing process of limbs.
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