求翻译：由于在短时间内，整个国家的人群可以认为是不变的，所以，知道了OOP的改变也就可以算出人均OOP的变化。但是由于各个人群的收入并不固定，所以绝对指标的变化不能很好的反映OOP的变化，只有相对指标的变化应该更有说服意义。是什么意思？

Due to a short time, the whole country population can be considered to be constant, therefore, know the change of OOP also can be calculated per capita OOP the change. However, due to the various populations of the income is not fixed, absolute indicators of change can not be a good reflection oop c

Because in a short period of time, the whole country can be considered to be the people who do not change, so all the OOP, know that the change can be calculated per capita OOP changes. However, because of the crowd and don't have a fixed income, so there is absolutely no change of the indicators re

As a result of in a short time, entire national crowd may think is invariable, therefore, had known the OOP change also may figure out average per person OOP the change.But because each crowd's income is not fixed, therefore the absolute target change cannot the very good reflection OOP change, only

Because within a short time, people of the whole country can be considered to be the same, so know OOP you could calculate the change of per capita changes of OOP. But due to the income of the various populations are not fixed, so absolute indicators of change are not well reflect changes in OOP, on

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