Because it is the initial gateway to a program, the user interface must be able to serve multiple purposes.

因为用户界面是程序最初的入口，所以它必须能够用于多种目的。

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The next step is adding methods for your queries to the interface that serve your business requirements

其次是根据业务需求为你的接口增加查询方法

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Providing a collection of widgets that serve as building blocks for a rich Web user interface (UI).

提供了一组小部件(widget)，可作为丰富Web用户界面(UI)的构建块。

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This handheld device works with both Macs and PCs, and can serve as a portable USB 1.1 hard drive for either system--though by using the USB connection interface, you can expect a long wait when loading data to the device from your computer.

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