Necessity is the mother of invention, but patent right is the father. - Josh Billings.
需要是发明之母，但专利权是发明之父！——乔什·比林斯。
If necessity is the mother of invention, discontent is the father of progress.
如果需要是发明之母，不满足就是进步之父。
If necessity is the mother of invention, discontent is the father of progress.
如果需要是发明之母，不满足就是进步之父。
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