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It is always easy to find fault with a classification. There are a hundred ways of arranging any set of objects, and something may almost always be said against the best, and in favour of the worst of them. But the merits of a classification depend on the purposes to which it is instrumental.
分类总是很容易出错。任何一套物品的摆放方式都有上百种，而有些东西几乎总是说得对最好的，说得对最坏的。但是，分类的优点取决于分类的目的。