Water vapour condenses to form clouds.
水蒸汽冷凝形成云。
It would be better if there were some way to see atmospheric water while it is still vapour, before raindrops form.
如果我们能找到一些能在雨滴形成以前的蒸汽状态下就观察到大气水方法，情况会变的好一些。
Water vapour condenses to form thousands of tiny water droplets which scatter light.
水蒸气冷凝形成无数的小水滴，使光线发生散射。
The chemicals fired into the sky, usually dry ice or silver iodide, are supposed to provide a surface for water vapour to form liquid rain.
发射上天的化学物通常是干冰或碘化银，它们应该能为水蒸汽提供一个表面以凝结成雨滴。
A place in which an explosive atmosphere consisting of a mixture with air of flammable substances in the form of gas, vapour or mist is present continuously or for long periods.
爆炸性环境中的爆炸混合物以气体、蒸气或薄雾形式连续出现或长时间存在的场所。
As water vapour rises, clouds form in the air.
当水蒸气上升时，云就在空中形成了。
As water vapour rises, clouds form in the air.
当水蒸气上升时，云就在空中形成了。
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