火灾探测器可以形象的比喻为现代建筑消防系统中的哨兵，在火灾自动报警系统正常运行状态下，“哨兵”的执勤状态不能有一丝倦怠，稍微的疏忽和大意都会给整个系统带来无法想象的恶果，最终导致自动报警系统所保卫的整座建筑毁灭在一个“生病”的“哨兵”身上。一个终日紧张工 Fire detectors can be compared to the sentry in the modern building fire protection system. Under the normal operation of the automatic fire alarm system, the “sentinel” can’t be overwhelmed with the state of duty. A slight oversight and carelessness can bring unimaginable to the entire system. The evil results eventually led to the destruction of the entire building, which was guarded by the automatic alarm system, on a “sick” sentry. A tight day-time work