Finally we defined roles to describe the boundary of the DAS, and it belongs to user interface tier.

定义角色来划分系统边界，角色位于用户接口层。

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These examples demonstrate adaptive presentation using XML at the user interface level, and such adaptations can also be part of the logical tier of the application.

这些示例展示了使用XML实现的用户界面层的自适应表示，这类自适应调整也可以是应用程序逻辑层的一部分。

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Also in the front tier is the user interface component.

在前端这一层还有用户界面组件。

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