云的用法和样例：
例句
-
云层的构成方式有好几种。
There are several kinds of cloud formations. -
乌云预示着暴风雨的到来。
The clouds presage a storm. -
云层正在堆积。
Clouds are banking up. -
太阳消失在一片云后面。
The sun disappeared behind a cloud. -
乌云预示着暴风雨即将来临。
The clouds threatened a big storm. -
乌云是雨或雪将至的预兆。
Dark clouds are a sign of rain or snow. -
云凝结成雨。
Clouds distil rain. -
云是天空中的水汽团。
A cloud is a mass of vapor in the sky.
