smoke alarm
英 [ˈsməʊk əlɑːm]
美 [ˈsmoʊk əlɑːrm]
n. 烟雾报警器(用于预防火灾)
牛津词典
noun
- 烟雾报警器（用于预防火灾）
a device that makes a loud noise if smoke is in the air to warn you of a fire
柯林斯词典
- (预防火灾的)烟雾报警器
Asmoke alarmor asmoke detectoris a device fixed to the ceiling of a room which makes a loud noise if there is smoke in the air, to warn people.
英英释义
noun
- an alarm that is tripped off by fire or smoke