This paper first introduces J2EE frame and n-tier model of enterprise application.
首先介绍了J2EE框架和企业应用的多层结构模型；
Is based on the n-tier model and supports browser users (client node) and mobile users (pervasive user node) accessing back-end applications.
基于n层模型，支持浏览器用户(client节点)和移动用户(pervasive user节点)访问后端应用程序。
This allows n-tier relationships to be easily captured in the model.
这使得模型中的n层关系可以很容易的被捕获。
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