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A sliver of light showed under the door.

门底下现出一丝亮光。

《牛津词典》

The light was on and the door was open.

灯亮着，门开着。

《柯林斯英汉双解大词典》

And of course it exists in a semiotic relationship to a white light over a street door which means "this is my house; if you wish you can ring the bell but I'd just as soon you stayed out."

当然它是存在于一个语义篇中的,而临街门上的白灯则意味着,这是我的房子，你要进来必须按门铃,但是你最好别进来“

耶鲁公开课 - 文学理论导论课程节选

Obviously, it doesn't mean "come in" in the sense of the red light over a street door.

当然，它不像临街灯一样表示,进来吧。

耶鲁公开课 - 文学理论导论课程节选

All right. Just some other examples: a red light over a street door.

好吧，现在让我们看看例子：,临街门上的红灯。

耶鲁公开课 - 文学理论导论课程节选

Everything was covered with a thick layer of grime, from the old fashioned metal light fittings to door handles and banisters.

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We found someone to install a motion detector light outside her front door, to improve her safety at night.

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Kraft opened the door, and the light gleamed off the three shiny, silver footballs.

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