the crux

剑桥词典

the most important or serious part of a matter , problem , or argument
關鍵；核心；症結
The crux of the country's economic problems is its foreign debt . 外債是該國經濟問題的症結所在。
The issue of an arms embargo will be at the crux of the negotiations in Geneva. 武器禁運將是日內瓦談判的核心議題。 返回 the crux