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Visitor mode is to encapsulate some operations applied to a certain data structure. Once these operations need to be modified, the data structure that accepts this operation can be saved unchanged. Visitor mode is suitable for systems with relatively stable data structures. It reduces the coupling degree between data structures and operations acting on data structures, making the set of operations relatively free to change. The specific structure diagram is as follows:1949年10月1日新中国成立。人民解放军继续南下。广州解放前夜，国民党特务美制登陆舰“联荣号”溃逃台湾，途中停泊澳门内港。3. Ships at anchor may also use existing working lights or equivalent lights to illuminate the deck, and ships of 100m and more in length shall use such lights.香荽听了眼睛闪亮。As a module, you can introduce attributes or methods provided by other modules as needed for your own module to use.For subsequent events, it is nothing more than to intercept or not to intercept, and the decision is still in the code of Part 2. The result of the decision is whether to enter the if numbered 3. If so, if it is not a down event, it will jump out of the if numbered 3 directly.王尚书顿时面色发黑，堂上众人也都忍无可忍，不知该笑还是怎样，反正这样的堂审是他们从没见过的。