An actor is an initiator when its role is to set the use case in motion.
如果某个参与者的作用是启动用例，则它的角色就是启动器。
It is worth mentioning the central role played by the use-case model in this work as in any RUP-based software development project.
值得提到的是在此工作中的用例模型所扮演的重要角色与在任何基于RUP的软件开发项目中一样。
In particular, we'll pay attention to the role of perspective in use case modeling.
特别地，我们要注意在用例建模中透视图的角色。
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