用户数据没有更新！
This picture should be constantly updated as the underlying data changes, so the user understands not only the current state of the problem domain but also how changes affect the domain.
这一情景应当随着基础数据的变化而时时更新，这样，用户不但能够理解问题领域的现状，也能知道各项变化是如何影响该领域的。
This picture should be constantly updated as the underlying data changes, so the user understands not only the current state of the problem domain but also how changes affect the domain.
这一情景应当随着基础数据的变化而时时更新，这样，用户不但能够理解问题领域的现状，也能知道各项变化是如何影响该领域的。
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