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。

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The flow of document information mainly includes three aspects: signal coding, information content and material carrier.

文献信息流的结构主要包括三个基本方面：信号编码、信息内容和物质载体。

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The flow of material, energy, population, information and species in urban landscape are the primary functional flows sustaining the urban structure and functions.

城市景观中的物质流、能量流、人口流和信息流等，是维持城市景观结构的主要功能流。

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Over the years, the SEC has subtly shifted from its traditional role of compelling disclosure to obstructing efforts to speed and broaden the flow of material information to investors.

FORBES: Why the SEC Is In Danger of Becoming Irrelevant ( February 28, 2006 )

Mentioned above, the Communications Decency Act is legislation that Congress passed to protect the free flow of information online by stating that websites could not be sued for carrying defamatory material.

FORBES: The frustrating quest for protection from anonymous Web surfers