应急照明是用于主电源失效时提供照明的独立子系统。

A、Emergency Lighting 应急照明] is a 是一个] independent subsystem 独立子系统] used to 用于] provide illumination 提供照明] in case of 万一] primary electrical power failure 主电源故障]。
B、Urgency Lights 紧急灯光] that supply 提供] the lights 灯光] when the 当] major electronic 主要电子] power fails 功率故障] is a 是一个] separate subsystem 独立子系统]。
C、Ambulance Lights 救护车灯] is used to supply 用来提供] lights if 如果] the main 主要的] electrical sources 电源] malfunctions 故障] as an independent 作为一个独立的] subsystem 子系统]。