分子是1，分母是等于或大于2的自然数的分数叫做单位分数，记为1/n.单位分数又叫分数单位或“单分子分数”，它还有一个名称“埃及分数”
埃及法老时期用所谓单位分数。
In Egypt, so called unit fraction was in use in The Times of the pharaohs.
摩尔分数或比率，但它是有单位的。
它看起来或许不像这样，因为它包含了很多摩尔分数，当然它看起来不像有单位的。
It may not look like it because it's a bunch of mole fractions, and it certainly doesn't look like it has any units.
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