In spring, the sky is very blue, the cloud is white, and the air is fresh.

春天，天空很蓝，云是白的，空气是新鲜的。

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There is a white cloud in the sky.

天空中有一朵白云。

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The daytime quality of light in forests varies with the density of the vegetation, the angle of the Sun, and the amount of cloud in the sky.

森林里的日光质量随着植被密度、太阳照射角度和天空云层数量变化而变化。

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Despite what seems to be a deluge of fears surrounding computing-in-the-sky, cloud providers say they are working hard to make sure their cloud services safe.

CNN: How safe is cloud computing?

But in the middle of all this was a change in the sky color itself that gradually clarified as an upward-streaming brown cloud risen from the earth, as if the world was turned upside down.

NPR: E.L. Doctorow on Sherman and 'The March'