当进行用例建模时，您的目的是使用参与者来对角色建模，而不是对物理的、现实世界的人、组织或系统本身。
When you are use-case modeling, your goal is to use actors to model roles and not the physical, real-world people, organizations, or systems themselves.
实现业务流程建模的目的是多种多样的，实现的抽象和细节层面也各有不同。
Business process modeling is done for a variety of purposes and at many levels of abstraction and detail.
定义指定建模的内容，而目的描述模型用于什么。
The definition identifies what is modeled, and the purpose describes what the model is used for.
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