The fact that Nokia has demonstrated its ability to defeat Apple -- after the most bitterly contested patent dispute that this industry has seen to date -- is a clear proof of concept.

此次诺基亚通过手机行业迄今为止争辩最激烈的专利诉讼，击败苹果便是一个明证。

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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