In system high-level design, MVC design pattern is applied to design the three-layer system architecture and the role and benefits of each layer are explained.
在系统概要设计中，以MVC设计模式为主导思想，设计出系统的三层体系结构，并详细介绍了各个层次的作用和优点。
The interface of three-layer switch is the component that exchange data between switch and other devices in network it play a key role in switch system.
三层交换机接口指的是交换机系统与网络中的其它设备交换数据并相互作用的部分，在交换机系统中起着至关重要的作用。
The whole structure of the system is three layer construction, the head connecting into layer, the center application layer and the database support layer of back-end.
系统的整体架构为三层结构，前端接入层、中间应用层和后端数据库支持层。
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