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

如遇火警，由最口离开大楼。

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

人们认为火警报警器响是个恶作剧。

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

消防队员接到火警电话时，房子是一片火海。

They heard the fire alarm.

他们听到了火警警报。