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理解就是知道什么導致什么。

神經病就是既不肯聽勸又不肯換個話題。

The more you invest in a relationship, the more valuable it becomes.

The natural effort of every individual to better his own condition， when suffered to exert itself with freedom and security， is so powerful a principle that it is alone， and without any assistance， not only capable of carrying on the society to wealth and prosperity but of surmounting a hundred impertinent obstructions with which the folly of human laws too often encumbers its operations.

兒童首先發揮功能的是感覺器官。