该体系结构模型将系统划分为客户端表示层、应用服务层、数据层。
The three-layered architecture model partition the information system into the client present layer, application service layer and database layer.
基于此原因，它们必须使用MANDATORY事务属性，这表示方法需要事务，但不应该在别处开始它(比如说在客户端层中)。
For this reason, they must use a transaction attribute of MANDATORY, indicating that a transaction is needed by the method but it should have been started elsewhere (such as in the client layer).
惟一的不同点在于客户端的本质和中间层的表示层。
The only differences are the nature of the client and the presentation layer of the middle tier.
图1中的Web浏览器客户端作为GUI的前端，使用表示层中的BrowserRequestHandler生成的HTML提供显示功能。
The Web browser client in Figure 1 ACTS as a GUI front end providing display functions using HTML generated by the browser Request Handler in the presentation layer.
表示层处在客户端，由一个通用的浏览器支持。
The presentation layer is placed in client anywhere supported by general browser.
客户端或表示层必须具有将从中间层接收的用于类的类型定义。
The client or presentation tier must have type definitions for the classes that it will be receiving from the middle tier.
客户端或表示层必须具有将从中间层接收的用于类的类型定义。
The client or presentation tier must have type definitions for the classes that it will be receiving from the middle tier.
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