在研究查询执行计划的问题时，片段解释和片段实绩是非常强大的特性。

Section explains and section actuals are very powerful features to investigate problems with a query execution plan.

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另外，在出现新的发行版时，会引入基于用户反馈的新特性和新功能，而旧的问题则得到修补。

In addition, as new releases occur, new features, and functionality based on user feedback is introduced and old problems are remedied.

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所有内容都来自于工作说明，我们得到特性列表和用例图，分解问题，然后选择一个用例开始迭代。

All from a statement of work, we can derive the feature list and use case diagrams, break up the problem, and then pick a use case to start to iterate.

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