An electric network for of clear layer, simple structure, standard connection, rational redundancy and appropriate advance technology is set up, "N-1" standard of city network is realized.

建立层次清晰、结构简单、接线规范、冗余度合理、技术适度超前的电网框架，实现城市电网“N - 1”准则。

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Considering various aspects, N layer logic structure is used in designing the system to fulfill complicated business functions by function calling regularly through layers.

基于各方面的考虑，我们在系统设计时采用N层逻辑结构，通过上下层之间按照一定规则的调用，从而完成了多个复杂的业务功能。

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Secondly project relevant background introduced the N-layer Architecturein software development, The software developer has put forward the concepts of 3-layers of structure in recent years.

其次项目的相关背景材料中介绍了软件开发的N-层体系结构，近年来软件开发商提出了3-层结构的概念。

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