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What's an expert? I read somewhere, that the more a man knows, the more he knows, he doesn't know. So I suppose one definition of an expert would be someone who doesn't admit out loud that he knows enough about a subject to know he doesn't really know how much.

一位专家是什么?我在什么地方读到过，一个人知道的越多，他知道的越多，他不知道的越多。所以我想，专家的一个定义是，他不会大声承认自己对某一学科的了解足够多，以至于知道自己实际上不知道多少。

— Malcolm Forbes 马尔科姆·福布斯