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。
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.
爱因斯坦发现了支配宇宙的规律，他的这些发现，不是在实验室取得的，也不是在天文台取得的，而是在其书房的书案上取得的。
Einstein discovered the laws that govern the universe, not in a laboratory or in an observatory, but at the desk in his study.
爱因斯坦发现了支配宇宙的规律，他的这些发现，不是在实验室取得的，也不是在天文台取得的，而是在其书房的书案上取得的。
Einstein discovered the laws that govern the universe, not in a laboratory or in an observatory, but at the desk in his study.
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