天空突然布满乌云。

The sky became suddenly overcast with clouds.

youdao

天空中布满了乌云，恐怕要下雨了。

With all the dark clouds in the sky, it looks like it will rain.

youdao

天空中布满了乌云，恐怕要下雨了。

With all the dark clouds in the sky, it looks like it will rain.

youdao