nub
n[sing]
the ~ of sth central or essential point of a problem, matter, etc (问题、 事情等的)中心,要点
The nub of the problem is our poor export performance. 问题的关键是我们出口贸易方面太差.
🗣️ 情景例句
We have a very important meeting on at the moment.
现在我们正在开一个非常重要的会。
Would he have seen you if you hadn't waved to him?
如果你没向他招手他会看见你吗?
Towards midday, a girl heard a muffed cry coming from behind on of the walls.