基于这些用例，测试可以在一个受限层次上进行，因为用例只描述执行者和系统的交互。
Based on use cases, testing can progress on a limited level since use cases only describe the interactions between actors and the system.
人工执行者在当业务流程被建模的时候出现，同时在模型中也会展示系统的其它方面，比如管理与安全等。
Human actors appear when business processes are modeled, and also in models showing other aspects of the system, such as management and security.
在场景渲染完成之后，场景中的元图形会被发送到一个执行者中由显示子系统处理。
As the rendering of a scene is completed, the shape "primitives" that are part of the scene are sent to an actor for a display subsystem.
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