I don't like the look of those clouds.
看那些云的样子，我觉得可能要下雨。
The plane was flying in cloud most of the way.
飞机一路大多在云层里飞行。
We could see the moon through a break in the clouds.
我们能从云缝里看到月亮。
Fog and low cloud cover are expected this afternoon.
预计今天下午有雾和低空云层。
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。