用例设计第2步：描述设计对象之间的交互。
Use Case design step 2: Describe interactions between design objects.
这个库通过询问服务器响应来确定如何进一步与服务器交互。
The library figures out how to further interact with the server by interrogating the server responses.
视图。视图负责应用程序的数据显示以及向用户提供控制选项，使用户可以与系统进行进一步交互。
The view is responsible for displaying the application data and presenting the control that allows the users to further interact with the system.
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