名词火警，报火机，警钟

1. 火灾报警：使用低压电力线进行通信,可以方便的组建计算机局域网(LAN)、传递远程监视图像、实现自动抄表(Automatic Meter Reading)系统和用于火灾报警(Fire Alarm)系统等.

2. 火警钟;火警警报：finishing works 终饰工程 | fire alarm 火警钟;火警警报 | fire alarm breakglass unit 易碎玻璃警报器;火警警报玻璃箱

3. 火警警报器,火警钟：fine-adjustment 微调,细调 | fire alarm 火警警报器,火警钟 | first law of thermodynamics 热力学第一定律

1. 火警报警器;火警钟
A fire alarm is a device that makes a noise, for example with a bell, to warn people when there is a fire.

noun

1. an alarm that is tripped off by fire or smoke

Synonym: smoke alarm

2. a shout or bell to warn that fire has broken out