等待状态的概念或许显得有些抽象，你或许会问这和工作流或过程语言的讨论有什么关联性。

The concept of wait states might seem a bit abstract and you might wonder why this is relevant in a discussion about workflow or process languages.

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把参与者抽象为角色将使一个工作流更为健壮。

Ing participants into roles makes a workflow more robust.

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使工作流的逻辑集中到抽象类是控制反转的例子。

The centralization of workflow logic into the abstract superclass is an example of inversion of control.

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