nub
n[sing]
the ~ of sth central or essential point of a problem, matter, etc (問題、 事情等的)中心,要點(diǎn)
The nub of the problem is our poor export performance. 問題的關(guān)鍵是我們出口貿(mào)易方面太差.
??? 情景例句
I believe stamp collecting is an interesting hobby.
我認(rèn)為收集郵票是一種有趣的愛好。
Today, they will introduce to you our newly built plant and research center.