空气中的水蒸气含量变化很多。
当温度降低时，空气中的水蒸气饱和度降低，湿度减小。
When temperature is lower, water vapour in the air, humidity decrease.
在不是非常干燥的空气中还有水蒸气存在。
There is also some water vapor in the air unless it is very dry.
在不是非常干燥的空气中还有水蒸气存在。
There is also some water vapor in the air unless it is very dry.
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