最后，通过记录系统将支持哪些角色交互，将所提出的系统放置于域模型的上下文中。
Finally, the proposed system is placed in context within the domain model by documenting which role interactions the system will support.
用例模型应该将系统放到上下文环境中，显示系统和外部参与者之间的边界，并描述系统和参与者之间的关键交互。
The use case model should place the system in context, showing the boundaries of the system and the external actors as well as describing the key interactions between the system and the actors.
该模型能保证交互过程中对话内容的一致性，对上下文的理解、对话控制和应答决策灵活自然。
This model is consistent during the dialog transaction, so that it can understand the user according to the context. Its dialog control and response decision are both natural and flexible.
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