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。

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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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They therefore seem to favour warm areas and times, suggesting that they consist of volatile material.

看起来它们在温暖的区域和时节更为明显，这表明其可能是挥发性物质。

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"The guess is that both the water and the dark material, which we think is organic-rich material, were delivered by the same objects impacting Mercury: some mixture of comets and the kinds of asteroids that are rich in organic and volatile material like water ice, " Prof Solomon said.

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Labor costs, as well as volatile raw material expenses, badly impaired the business.

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The one important fact is that fracturing of an individual well emits relatively small amounts of volatile compounds, the material of concern, and some wells emit none at all.

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