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If you are new to modeling, or if you've modeled before but still can't quite understand when to model, why you should model, or how to approach a modeling task, start with this section.
如果您是一位建模的新手，或者您曾经有过建模的经历，但是仍然对什么时候建模，为什么建模，或者如何完成建模的任务不是很了解，那么就从这个部分开始吧。
During business process modeling, a task is identified as manual, and different roles are assigned to each of these human tasks.
在业务流程建模期间，会将人工任务标识为手工任务，并为每个人工任务分配不同的角色。
Imagine that they were modeling the concepts of work product, role, and task using UML.
假定他们在使用uml建模工作产品、角色和任务的概念。
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