These clouds are mostly ammonia ices, with water clouds lower down.

这些云主要是氨冰，下面是水构成的云。

There are water clouds in the thin atmosphere of Mars, so why not rainbows?

火星稀薄的大气中有水云，为什么没有彩虹呢？

The water clouded and I could no longer see the river bed.

【cloud】水变得浑浊了，我再也看不清河床了。

Because everyone needs water, cloud seeding is becoming more and more popular, with scientists from over fifty countries using the method to extract rain from clouds.

因为每个人都需要水，所以人工降水变得越来越流行，来自50多个国家的科学家都使用这种方法从云中获得雨水。