cloud是可数名词还是不可数名词

The plane climbed until it was clear of the clouds.

飞机爬升直至穿出了云层。

The sky was full of dark masses of clouds.

天空中乌云密布。

A cloud of dust rose as the truck drove off.

卡车开过时扬起一片灰尘。

The sun disappeared behind a bank of clouds.

太阳消失在一大片云后面。

It was beginning to cloud over.

天空开始阴云密布。

The dark clouds in the sky meant that a storm was coming.

天空中的乌云预示暴风雨即将来临。