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As Cuvier could correctly describe a whole animal by the contemplation of a single bone, so the observer who has thoroughly understood one link in a series of incidents should be able to accurately state all the other ones, both before and after.
居维叶只看一根骨头,就能正确地描述出整个动物,因此,一个完全了解一系列事件中的一个环节的观察者,应该能够准确地描述出所有其他环节,包括之前和之后。