It was beginning to cloud over.

天空开始阴云密布。

《牛津词典》

Her father's illness cast a cloud over her wedding day.

她父亲的病给她的结婚喜庆日蒙上了一层阴影。

《牛津词典》

The Alps expect heavy cloud over the weekend with light snow flurries and strong winds.

阿尔卑斯山预计周末是多云，有小阵雪和强风。

《柯林斯英汉双解大词典》

Air traffic over much of Europe came to a halt for six days because of the huge cloud of ash from a volcano in Iceland.

VOA: special.2010.04.23

A big cloud of smoke rose high in the air over Fort Sumter.

VOA: special.2009.08.13

A large fire then broke out, engulfing several shops and spewing a cloud of gray smoke over the area.

VOA: standard.2009.10.28

Wendell cited some recent statistics that would sort of cast a cloud over that view.

WHITEHOUSE: Press Briefing

Winds blew the cloud over northern France on Monday night and then into England.

BBC: Foul smell complaints in southern England after gas leak

One lingering cloud over global financial markets is the ongoing uncertainty about debt-plagued Europe.

FORBES: Economists Look For Bernanke To Keep 'Powder Dry' In Highly Anticipated Speech