当空气进一步冷却到容纳更多水汽的能力为零(的那一点)时，饱和状态就达到了。
When air is cooled to a point at which the air's capacity to hold more water vapor is zero, saturation is reached.
在温度不变时，通过加入水汽而使空气达到饱和。
With the temperature unchanged, the air is made to reach condensation by adding water.
当冷空气遇到了秋雨时，丰富的水汽很快达到饱和状态，随之变为蒙蒙烟雨或潮湿的雾气。
When the cold air encounters autumn rain, the abundant water vapor in the air soon reaches saturation, and then it turns into misty rain or fog.
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