Lightning is caused by clouds discharging electricity.

闪电是由云层放电产生的。

《牛津词典》

The moon was hidden by clouds.

月亮被云遮住了。

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Both these devices worked well in sunny climates; but in northern Europe, the sun may be hidden by clouds for weeks at a time, while temperatures vary not only seasonally but from day to night.

这两种装置在阳光充足的气候条件下工作良好；但在北欧，太阳可能一次被云层遮挡数周，而温度不仅随着季节变化，而且还随着昼夜变化。

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The challenge is to pick out oil from other dark spots, such as shadows made by clouds or patches of seaweed.

VOA: standard.2010.07.05

He heaps up the waters with a blast of wind, like a storm at sea, Baal and this is reminiscent of the Canaanite storm god Baal, as you see on your handout. Baal is said to ride on the clouds, he's a storm god, and he's accompanied by wind and rain.

他用狂风掀起巨浪，就像海上的风暴，难免让人想起迦南传说中的暴风之神，就像你们在讲义上看到的一样，Baal腾云驾雾，是暴风之神，带来风和雨。

耶鲁公开课 - 旧约导论课程节选

At the top of rocks was a man, his body was almost hidden by the storm clouds that hung low over the light house.

VOA: special.2010.05.08

The amount of production depends on whether the sun is up and unobstructed by clouds.

FORBES: U.S. Solar Market Grew 76% in 2012

Here outside the city limits cars speed by clouds of red dust in their wake.

NPR: Natasha Trethewey: If My Mom Could See Us Now

Spectators in Pakistan and Bangladesh suffered the same fate as those in the UK, having their views obscured by clouds.

BBC: 11 August