The definition of material flow in both the narrow and broad sense and the distinction and relationships between material flow, tradeflow 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。
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When I was five, my brother was shot by an Israeli soldier - since then, I have been dedicated to uniting the Arab countries throughout the Middle East and retain a tradeflow with the west.
The research via gravity model shows that the system quality of each country will impact bilateral trade effectively, and the tradeflow is large between the countries with similar systems.