In case of fire, leave the building by the nearest exit.

如遇警，最近的出口离开大楼。

It was thought that the fire alarm had been set off as a prank.

人们警报警器响是个恶作剧。

By the time firefighters were called the house was well ablaze.

消防队员接到警电话时，房子是一片海。

They heard the fire alarm.

他们听到了警警报。