·（2） 显式模型（Explicit Model）和隐式模型（Inferred Model）。显示模型允许用户通过回答知识工程师或者系统提出的问题，参与创建自己的模型；隐式模型是在用户...
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多次撤销存在的问题不是因为它的行为， 而是因为其显式模型。
The problems with multiple Undo are not due to its behavior as much as they are due to its manifest model.
通常的显式模型迫使用户不仅要意识到每一个步骤，而且要依次恢复每一个动作。
The usual manifest model forces her not only to be aware of every intermediate step but to reverse each of them, in turn.
此类模型使他们能够显式描述某些功能区，并展示他们之间的相互关系。
Such a model enables them to explicitly depict certain functional areas and show how they are related to each other.
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