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。
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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