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.
他每天读书到深夜，有时候不知不觉伏在书案上就睡着了。
Everyday he studied far into the night. Sometimes he fell asleep on the writing desk.
关于入区准则的有利影响已成为教科书案例(其利端不言而喻)。
It is a textbook case of the beneficial effects of meeting the entry criteria.
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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