该蒸气含有更多易挥发组分，并沿塔向上层塔板上升。
This vapour, which moves up to the next tray in the column, is richer in the more volatile components.
因此，当该蒸汽被冷凝时，冷凝液中含有较多易挥发组分。
Therefore, when this vapour is cooled and condensed, the condensate will contain more volatile components.
还可用内标法和外标法对啤酒中的不挥发组分进行定量检测分析。
Besides, quantitation analysis of involatile compositions in beer could be done by internal standard method or by external standard method.
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