The user role responsible for invoking the service is identified (an actor is associated with each state).

标识了负责调用服务的用户角色（参与者与每个状态相关联）。

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Responsible for showing information to the user and interpreting the user's commands. The external actor might sometimes be another computer system rather than a human user.

负责向用户显示信息以及解释用户的命令。外部的用户有时可能是另外一个计算机系统而不是真正的人。

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Although choices may be very hard in some cases, he believes that where there is choice, it is both moral and respectful to the actor to hold the actor responsible.

虽然在有些时候选择十分的困难，但是他认为只要有选择的余地，对于行为人来说负有责任就是道德的和受人尊重的。

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Ghana has also been a leader, a responsible actor on the international stage, working in the region to help stabilize and reduce conflict there.

WHITEHOUSE: President Obama��s Bilateral Meeting with President Mills of Ghana | The White House

Now, what we also recognized very early on was that it was in our national security interest to have a stable, sovereign Afghanistan that was a responsible international actor, that was in partnership with us, and that that required Afghanistan to have its own security capacity and to be on a path that was more likely to achieve prosperity and peace for its own people.

WHITEHOUSE: President Obama and President Karzai Hold a Press Conference | The White House