Necessity is the mother of invention.
需母。
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It is said that necessity is the mother of invention.
有人说，是发之母。
His story is proof that necessity is truly the mother of invention.
他的故，确实是发之母。
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" .
没有人能更实这两条格言的真实性，“天性是很容易满足的；”并且，“是发之母”。
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母。
，
