大多数小学生都学过当水蒸气凝结到一定程度就形成了云。
Most elementary school students learn that clouds form when enough water vapor condenses.
和其他云一样，它是当空气达到凝结点，即空气团的温度冷却到使其中的水蒸气凝结成液态水滴的温度时形成的。
Like all clouds, it forms when the air reaches its dew point, which is the temperature to which an air mass must be cooled for the water vapor in it to condense into liquid droplets.
通过大气层中水蒸气的冷凝作用形成了云，凝结在成簇的氨分子和硫酸分子周围。
Clouds are formed by the condensation of water vapour in the atmosphere around clusters of molecules such as ammonia and sulphuric acid.
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