action类应该控制应用程序的流程，而不应该控制应用程序的逻辑。
The Action class should control the flow and not the logic of the application.
关键点是抽象类控制这个流程。
The key concept is that it is the abstract base class that controls the workflow.
关键点是抽象类控制这个流程。
The key concept is that it is the abstract base class that controls the workflow.
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