Whereas use cases capture a generalized view of a user and a task, scenarios describe a specific instance of a use case in terms of a concrete workflow.

尽管用例获取用户和任务的一般化观点，但是依据具体的工作流，情境描述具体的用例实例。

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In this case, there is only one parameter-id-and it specifies the Twitter name of the user whose timeline you want to view.

在本例中，只有一个参数—id—而且它指定了您想要查看其时间表的那个用户的twitter名。

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In the case of a postback (the user returns to a page she has previously accessed), the view corresponding to the page already exists, so it needs only to be restored.

在后视图(postback)的情况中(用户返回之前访问过的页面)，包含页面的视图早已经存在了，因此只需要进行恢复就可以了。

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