Regional material circulation system is a sub-system of the regional economy system.
区域物流系统是区域经济大系统中的一个子系统。
In the biological class, has studied the living system material circulation.
生物课上，学了生物系统的物质循环。
So material management information system mast register the whole process of material circulation.
因此物资管理信息系统需要记录物资流通的全过程。
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