准确的，不时翻译网抄的
The gross domestic income and consumption in a region over a period of time relies on the basic level of consumption in that area.
In reality, it is difficult to obtain the accuracy of these parametres,so they can be seen as vague, from the above statistics the gross domestic income can be worked out, consumption and system parametres and relationships.
Clearly, in reality, a vague system is more widely used, problem solving has its own flexibility and effectiveness.
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