A single red LED shows that the power is switched on.

单支红色发光二极管表示电源已接通。

《牛津词典》

youdao

I was led to a small room bathed in soft red light.

我被领进了一个被柔和的红光笼罩着的小房间。

《柯林斯英汉双解大词典》

The so-called Red Shirts, led by the United Democratic Front against Dictatorship,or UDD, have the backing of the main parliamentary opposition group, the Puea Thai Party.

VOA: standard.2010.03.20

Mantle had led the Yankees to a first place finish and a return to the World Series while the Jensen-led Red Sox finished in third place 13 games behind the Yankees.

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Still, he says, he followed a fil rouge--a red thread--that led him unswervingly toward Switzerland's grand patrimoine de l'horlogerie.

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In this case, Richardson combined a couple of Arduino circuit boards with an infrared LED light -- that little red bubble on the front of your TV remote -- and programmed the whole thing to interact with a TV's closed-captioning system.

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