The more students who enroll in a course but don't come to campus, the more the school saves on keeping the lights on in the classrooms, paying doorkeepers, and maintaining parking lots.

报名参加课程但不来校园的学生越多，学校在教室照明、支付门卫工资和维护停车场方面节省的开支就越多。

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When he left the room, it was like the end of a movie, when the lights come back on, and you look around, and then remember where you were and what you were doing.

当他离开房间的时候，我们就好像看完一场电影刚亮灯的时候，你要左右看一会儿，才想起自己在哪里，刚才做了些什么。

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And the city's lights come on at a time that the atmosphere could very well do without them: when it is cleansing itself of the pollution of the day.

夜晚，城市上空的大气在忙于清除它白天所受到的污染。 本来这项工作会很有成效，但这时这座城市的灯光亮了起来，工作受到了干扰。

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By going a little further down the energy tech value chain and viewing the nascent LED industry through this familiar lens, they can walk in and let the lights come on.

FORBES: A New Source of Green Energy: LEDs

The car detects the proximity of the key and, just as you're about to reach the door, the lights come on and the door handles extend from their normally retracted positions.

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We've never felt quite so welcomed as we have when walking up to the Model S. The car detects the proximity of the key and, just as you're about to reach the door, the lights come on and the door handles extend from their normally retracted positions.

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