rub
US /rʌb/
UK /rʌb/

动词
1.
名词
1.
2.
症结, 困难
a difficulty or problem, especially one that is hidden or not immediately obvious
示例:
•
The only rub is that we don't have enough money.
唯一的症结是我们没有足够的钱。
•
Here's the rub: we need to finish this by tomorrow.
症结在于:我们明天之前必须完成这个。
在 Lingoland 学习这个单词