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来源:雅诚德英语网
The evolution of North American horse, which was once presented as a classic textbook example of gradual evolution, is now providing equally compelling evidence for punctuated equilibrium.
北美马的进化,曾经被作为一个经典的渐进演化的教科书案例,现在为点断平衡说提供了同样令人信服的证据。