In previous columns, we have established a use case model in which actors represent external entities that interact with our system.
在前面的专栏文章中，我们构建了一个用例模型，参与者在其中表示与系统交互的外部实体。
Develop a model of the user interface flow, showing how a given actor from the business process will interact with the system during a typical "session".
开发一个用户界面流程模型，显示在典型“会话”期间来自业务流程的给定参与者如何与系统相交互。
The use case model also includes use case diagrams and activity diagrams that describe how users interact with the system.
用例模型还包括描述用户与系统如何交互的用例图和活动图。
These use case realizations model how the parts of the system interact within the context of a specific use case.
这些用例实现对系统的一些部分如何在具体用例环境中交互进行建模。
Using Object-orientation as a base , we model the system as a number of objects that interact.
通过应用面向对象的建模技术作为基础，我们把软件系统模型化为一组互相交互的对象集合。
The problem of oversimplification and improper selection of DC model, which exists in the DC modeling when AC and DC systems interact in AC/DC hybrid power system, is discussed.
讨论了目前研究交、直流混合电网交直流系统相互作用时在直流建模上存在的模型过度简化及模型选用不恰当的问题；
The problem of oversimplification and improper selection of DC model, which exists in the DC modeling when AC and DC systems interact in AC/DC hybrid power system, is discussed.
讨论了目前研究交、直流混合电网交直流系统相互作用时在直流建模上存在的模型过度简化及模型选用不恰当的问题；
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