用例标题上会有一点的变动：需求uc4被删除了，而添加了需求UC5(图15，“对已分支的需求文档所做的修改”)。

Here, there's a modification in the use case title: the requirement UC4 has been removed and the requirement UC5 has been added (Figure 15. Modification on branched requirements document).

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当用户长时间处理一个文档，她可能会期望存在一个已删除文本的仓库。

As a user works on a document for an extended time, she may desire a repository of deleted text.

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