I don't like the look of those clouds.
看那些云的樣子，我覺得可能要下雨。
The plane was flying in cloud most of the way.
飛機一路大多在云層里飛行。
We could see the moon through a break in the clouds.
我們能從云縫里看到月亮。
Fog and low cloud cover are expected this afternoon.
預計今天下午有霧和低空云層。
Her father's illness cast a cloud over her wedding day.
她父親的病給她的結婚喜慶日蒙上了一層陰影。