nub

1.a nub of gold.

一小块金。

2.That's the nub of it.

关键就在这里。

3.the nub of a story.

要点

4.the nub of the argument

争论要点

5.the nub of the problem lies elsewhere.

问题症结在其他地方。

6.he pressed down on the two nubs on top of the phone.

他按下电话机上端两个突起。