在这个方程序中，Y代表不同数量单位(x个)的平均成本。
In this equation, Y represents the average cost of different quantities (X) of units.
累积成本中累积两个字的重要性在于平均成本是x累积单位的均值。
The significance of the "cum" in cum average is that the average costs are computed for X cumulative units.
举例来说，过去的二十年里，德国的单位人工成本比欧元区平均水平高出12%，也因此得到了“欧洲病夫”的绰号。
Two decades ago Germany's unit Labour costs, for instance, were some 12% above the euro-zone average, earning it the epithet of the "sick man of Europe".
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