a contested concept
有争议的概念
以上为机器翻译结果，长、整句建议使用 人工翻译 。
Yet extinction has been a much contested concept.
NEWYORKER: The Sixth Extinction?
Tennessee's claim that it should continue to control the land stems from "acquiescence, " a concept in property law that it has the right to keep a boundary if it is not contested over a long period.
WSJ: In Latest War Between the States, Georgia Says Tennessee Is All Wet
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