柯林斯词典fire alarm (fire alarms) 1. N-COUNT A fire alarm is a device that makes a noise, for example, with a bell, to warn people when there is a fire. 火警报警器 The smoke sets off the fire alarm. 烟雾触发了火警报警器。 返回 fire alarm剑桥词典a device such as a bell or siren that warns the people in a building that the building is on fire 火警报警器，火警钟；火警报警器开关 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。 返回 fire alarm