Necessity is the mother of invention.
需。
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His story is proof that necessity is truly the mother of invention.
故事证明，需要确是发明之母。
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" .
没有人能更证这两条格言，“天是很容易满足；”并且，“需要是发明之母”。
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。
故事证明，
记（原版）
，“天
