您可能需要一个根本不执行任何工作的活动，例如，当您拥有一个需要某个活动的构造，但没有要执行的任何工作时。
You might need an activity that does nothing at all, such as when you have a construction that requires an activity, but there is no work to be done.
如果您将工作订单构造为一个OO应用程序，这些软件对象将包含所有必需的业务规则，并且理解应该遵循的业务流程。
If you constructed Work Order as an OO application, these software objects would contain all the necessary business rules and would understand the business processes that should be followed.
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