subject只是用户希望执行的任务或活动。
The subject is simply the task or action that the user wants to perform.
通常，此级别是由目标决定的，而不是由任务或活动决定的。
Usually this would be by objectives and not by tasks or activities.
服务提供者是接受来自服务请求者的消息以执行某项工作(某个任务或活动)的对象。
A service provider is an object that accepts messages from service requestors to execute an item of work? A task or an activity.
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