You decrease the mole fraction of the less volatile material in the gas phase.
更不易挥发的物质，在气相中的，摩尔分数减小了。
At the same time, the original mixture will contain more of the less volatile material.
同时，初始混合物中含有较多不易挥发组分。
At the same time, the original mixture will contain more of the less volatile material.
同时，初始混合物中含有较多不易挥发组分。
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