For both long and short running process use cases, there is no Primary Actor; they are always triggered by other use cases and don't directly involve any user interaction.
对于长时间运行和短时间运行的流程用例，并没有主要参与者；它们始终由其他用例触发，并不直接涉及任何用户交互。
The primary persona should drive the user interface design for every use case that involves the associated human actor.
主要角色应该为每个涉及相关人类参与者的用例推进用户界面设计。
Because use cases contain actor and goal information in real language, test cases for user acceptance can be written prior to the creation of tests for the other test phases.
因为用例包括参与者真实语言的目标信息，用户验收的测试用例可以在为其它测试阶段创建测试之前编写。
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