报警器

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。

Voice call the police, Briefness, Safety, Dependable ossesses battery capacity lack, Sensor damage warning, Can timely remind consumer to announciator proceed maintain .

声音报警，简单、安全、可靠具有电池容量不足、传感器损坏警告，可及时提醒用户对报警器进维护。

Last week all their silver was stolen; this week they’re putting in a burglar alarm! That’s really shutting the stable door after the horse has bolted.

上星期他们的银器全被偷走了，这星期他们才安装防盗报警器！这可真是马跑了才去关廐门。