I raised / sounded the alarm as soon as I saw the smoke.

我一看见烟就发出了警报。

Everyone fled from the building when the fire alarm sounded.

火警响起时，所有人都从大楼里逃了出来。

set the alarm for six

把闹钟定在6点

The alarm went off at five.

闹钟在5点时响了。

The news that the enemies were near alarmed everybody.

敌军迫近的消息使大家感到恐慌。