crux
[krʌks, krʊks]
n.
（问题的）中心，核心，结症;
坩埚;
关键;
症结;
例句:
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He explained what the Crux is, or rather, what it was.
他解释了什么是南十字座，或者更确切地说，过去南十字座是什么。
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Now we come to the crux of the matter .
现在我们来谈问题的症结。
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Where does the crux lie?
结症在哪里?
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The crux of his plan was the stress tests.
来自NEWYORKER
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Collaborations are the crux of Sawhney's work.
来自BBC
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Quite how this became a marketable crux evades common logic.
来自BBC