The clound is blocking the sun.

云挡住了太阳。

The airplane flew above the clound.

飞机飞过了云层。

A dark clound means it might rain soon.

一片乌云意味着可能很快会下雨。

Look at that beautiful clound in the sky.

看看天空中那朵美丽的云。

The shape of the clound looks like a dragon.

云的形状看起来像一条龙。