它只是提醒你，当你烤焦面包的时候，它就在那里！或者你的家里或学校里可能有灯。
It only reminds you it's there when you've burnt your bread! Or there may be lights in your home or school.
提醒他们在家里时关掉不需要的灯以节省能量。
Remind them to save energy by turning off unnecessary lights at home.
殡仪馆用的头车通常是一辆小型货车，顶部有琥珀色或紫色的灯提醒其它司机这是葬礼车队。
Mortuaries use lead vehicles, often a mini-van, with amber or purple lights on top to alert drivers to processionals.
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