在发生火灾时，灭火器至关重要。

Fire extinguishers are crucial ___in ___the ___event ___of a fire.

如果发生延误，乘客将立即被通知。

___In ___the ___event ___of a delay, passengers will be notified immediately.

在紧急情况下，遵循疏散程序。

___In ___the ___event ___of an emergency, follow the evacuation procedures.