溶液中存在的非挥发性溶质，总是使溶液的蒸气压降低。
The presence of a nonvolatile solute in a liquid always lowers the vapor pressure of the solution.
在气井生产过程中，由于天然气压力和温度的降低，水蒸气会凝析成液态水。
During the process of gas production in gas Wells, vapor will condensate into liquid water due to the cut down of pressure and temperature of natural gas.
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