Necessity is the mother of invention.
需。
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It is said that necessity is the mother of invention.
有人说，需要之母。
His story is proof that necessity is truly the mother of invention.
他的故事证，需要确实之母。
No man could more verify the truth of these two maxims, " That nature is very easily satisfied;" and, " That necessity is the mother of invention" .
没有人能更证实这两条格言的真实性，“天性很容易满足的；”并且，“需要之母”。
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