Necessity is the mother of invention.
需是明。
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It is said that necessity is the mother of invention.
有人说，需要是发之母。
His story is proof that necessity is truly the mother of invention.
他的故事，需要确是发之母。
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" .
没有人能这两条格言的真性，“天性是很容易满足的；”并且，“需要是发之母”。
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