crux

US /ˈkrʌks/
UK /ˈkrʌks/
"crux" picture
1.

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