The definition of material flow in both the narrow and broad sense and the distinction and relationships between material flow, trade flow and information flow are discussed.
本文论述了物流、商流、信息流以及它们之间的联系和区别，着重探讨了关于物流的狭义和广义的定义。
The research via gravity model shows that the system quality of each country will impact bilateral trade effectively, and the trade flow is large between the countries with similar systems.
通过应用引力模型的研究发现，各国制度的优劣对双边贸易有显著的影响，制度相似的国家间贸易量较大。
The research via gravity model shows that the system quality of each country will impact bilateral trade effectively, and the trade flow is large between the countries with similar systems.
通过应用引力模型的研究发现，各国制度的优劣对双边贸易有显著的影响，制度相似的国家间贸易量较大。
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