urgent

critical, acute, urgent

这些形容词均有“紧急的”或“严重的”之意。
critical: 指极为危急或缺乏的状况，而这种状况标志一种转折点。
acute: 通常指需要和缺乏的紧急程度。也指病情的严重。
urgent: 指情况紧急，急需解决问题。

形容词 urgent:

1. compelling immediate action
   同义词：pressing

1. The matter can wait until the next meeting; it's not urgent.
   这件事可以等到下次会议处理，不是急事。
2. It's not urgent we can do it next week or whenever.
   不是急事--我们可以下星期做或其他时候做。
3. I'm afraid something urgent has come up; I won't be able to see you tonight.
   很抱歉，有些急事; 今晚不能见你了。
4. It is urgent that food and clothing (should) be sent to the sufferers.
   急需将食物和衣服送给灾民。
5. I was prevented from going by urgent business.
   我因急事不能去。
6. They've made an urgent request for international aid.
   他们紧急请求国际援助。
7. Demanding prompt action; urgent.
   紧急的要求迅速行动的; 急切的
8. This work is not urgent; we can do it tomorrow.
   这件工作不急，我们可以明天再做。