According to an ecosystem'sessential function of substance circulation, energy exchanges and information transfer, the paper analyzes the function of E-Learning ecosystem.

根据生态系统的物质循环、能量流动和信息传递三大基本功能，分析了网络学习生态系统的功能。

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Compared with labor of substance production, the labor of learning has various characteristics.

与物质生产劳动相比较，学习劳动明显表现出多方面的特征。

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Seven functions of views about chemical substance, which are motivation, choose, interpret, establish, transplant, creation and direction, have importance influences students' learning chemistry.

它所具有的动机、选择、解释、建构、迁移、生成和定势等七项功能对学生学习化学会产生重要影响。

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According to the plan, when the homeless have found a permanent place to live, the state will offer them whatever social services they need to succeed in that house, from substance-abuse counseling to simple help in learning how to shop or how to balance a checkbook.

NPR: Chronically Homeless See New Woes in New Orleans