There are many ways of realization of VPN, including superposition mode and reciprocity mode.

VPN可以有多种实现方式，包括叠加模式和对等模式。

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At the same time, it builds up the model for this system and discusses the key technology in its development, also it puts forward the ways of realization.

同时建立了系统的模型，对开发中关键技术进行了讨论，并给出了具体程序说明实现方法。

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By the methods of literature study and logical analysis, the authors made an in-depth study on the connotation, characteristics and the ways of realization for "Mixing Sport into Life".

采用文献资料和逻辑分析等研究方法，对体育生活化的内涵、特征及实现路径进行深入研究。

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