Subclasses may override this method to perform special dispatching of action messages.
子类可以重写这个对象发送命令消息给特定的对象。
In fact, all those action signals are just messages to be more flexible!
事实上，所有行动的信号传递的信息就是要保持弹性。
If the messages below are spam, you do not need to take any action.
如果下列邮件是垃圾邮件，您不需要采取任何措施。
If the messages below are spam, you do not need to take any action.
如果下列邮件是垃圾邮件，您不需要采取任何措施。
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