crux

US /ˈkrʌks/

UK /ˈkrʌks/

症结, 关键, 核心

the most important or essential point of an issue or problem

•

The crux of the matter is that we don't have enough funding.

问题的症结在于我们没有足够的资金。

•

He finally got to the crux of his argument.

他终于谈到了他论点的核心。