safe light

例句：

1. 1. The safe light in the factory is always on during working hours.
   工厂里的安全灯在工作时间内总是开着。
2. 2.He turned on the emergency light to find his way out of the dark room.
   他打开了紧急灯，以便找到通往黑暗房间的路。
3. 3. The police used a warning light to alert drivers to the danger ahead.
   警方使用警示灯来警告司机前方的危险。