fire alarm
noun [ C ] uk/?fa??r ??lɑ?m/ us/?fa?r ??lɑ?rm/
火警报警器,火警钟;火警报警器开关
a device such as a bell or siren that warns the people in a building that the building is on fire
If the fire alarm goes off (= starts making a sound), leave the building calmly. 如果火警报警器响了,请保持镇定,离开大楼。


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