fire alarm siren

例句：

1. 1. The fire department is always on standby, ready to respond to any fire alarms.
   消防部门总是待命，随时准备应对任何火警。
2. 2. The fire alarm woke us up early in the morning.
   火警把我们叫醒，让我们在早上很早就起床了。
3. 3. The fire siren wailed as the building caught fire.
   大楼着火时，警报器尖叫起来。