crux

 Longman Dictionary of Contemporary English 5++朗文当代英语 5++LDOCE 5++朗文 5++crux /krʌks/ noun  the crux IMPORTANTthe most important part of a problem, question, argument etc 〔问题、论据等的〕核心，中心；症结the crux of The crux of the matter is how do we prevent a flood occurring again? 问题的关键是我们如何预防洪水再次发生？ The crux of the problem lay in the lack of equipment. 问题的症结在于缺乏设备。

Examples from the Corpus

crux• In the first place, v. 21b is a notorious crux of interpretation.• Whether we can get funding or not is the crux.• Finding a cheap source of energy is really the crux of the matter.• The women kicked off on fairly straight forward F7a, but the last move was the crux.• He didn't much care; that was the crux of the matter.• The crux of the court case is whether consumers deserve a refund.• The crux of the matter is that attitudes on the character and scope of planning have changed.Origin crux (1600-1700) Latin → CROSS2

crux nounChinese  

question, etc argument most part of a Corpus important problem, the

crux
crux /krʌks/ nounthe crux the most important part of a problem, question, argument etc
    the crux of
    The crux of the matter is how do we prevent a flood occurring again?
    The crux of the problem lay in the lack of equipment.

cruxBrE /krʌks/ 🔊NAmE /krʌks/ 🔊 noun [singular] the ~ (of sth) the most important or difficult part of a problem or an issue （难题或问题的）关键，最难点，症结 SYN nub ◆Now we come to the crux of the matter. 现在我们来谈问题的症结。🔊🔊