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.
通过收入和职业划分曾经是一个经典的市场细分，但是这种划分已经变得不那么有用。
Social factors. One classic segmentation is by income and occupation, but this is proving to be less and less useful.
蒙特斯也曾经上演过《大鲨鱼》里的经典镜头，把一条长75英尺的大白鲨叉到了孩子们正在游玩的海滩上。
Mr Mundus, too, once made the centrepiece of a classic "Jaws" scene, harpooning a great white in 75 feet of water off a beach where children played.
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