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There were swallows in the cloudless blue sky.

燕子在无云的蓝天上飞翔。

《柯林斯英汉双解大词典》

There is a white cloud in the sky.

天空中有一朵白云。

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I speak in a figurative way about the relationship between the earth and the sky, and I believe that there's a sky god.

我用一种修辞法,来说天地关系，我相信有一个天神。

耶鲁公开课 - 文学理论导论课程节选

They seem to be reaching toward the sky there, but not reaching toward the sky as in the cupola of a Baroque church where you're supposed to see God at the top.

而且这些建筑看上去都高耸入云,不过不像巴洛克式教堂高耸的塔楼那样,往顶上看时,你应该会看到雕刻着的上帝

耶鲁公开课 - 欧洲文明课程节选

More important still, there in the sky was a miniature Copernican system, visible to the aided eye.

NEWYORKER: Moon Man

Looking at this list, it should be obvious that are as many different clouds in the computing world as there are in the sky.

FORBES: Sorting Out the Clouds

Mr. JERMAINE JACKSON: When there are clouds in the sky, you'll get by if you smile.

NPR: Jackson Remembered During Emotional Service