幕布升起，剧场内的灯光暗了下来。

The lights in the theatre dimmed as the curtain rose.

《牛津词典》

房子里的灯光暗了下来。

The house lights faded.

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你在家走动时，你的房子会自动播放你最喜欢的音乐；当你想看电影时，你的房子会及时地为你把灯光暗下来。

When you're home, the house takes care of you by playing your favorite song whenever you walk in or instantaneously dimming the lights for a movie.

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How do we dim the lights?

我们怎么调暗灯光呢

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I knew the storyline before I went, but when the lights went down, and then the story came out.

我去看之前就知道故事情节了，但当灯光暗下来，演出开始，

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Now, let's dim the lights.

现在让我们调暗灯光

耶鲁公开课 - 欧洲文明课程节选