火急

例句：

1. 1. We need to act quickly if there's a fire at the school.
   如果学校着火了，我们需要迅速行动。
2. 2. The meeting is scheduled for tomorrow, so we must be on time.
   会议定于明天举行，所以我们必须准时到达。
3. 3. The doctor advised us to take immediate action in case of an emergency.
   医生建议我们在紧急情况下立即采取行动。