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These are the problems of my work and my own thoughts in my heart. Perhaps the problems I raised also have my own deficiencies in understanding, but I have written down my thoughts truthfully. I hope that any department of the company will not always consider problems from its own standpoint when working in the future, and will think more from other angles.邓布利多终于发现斯内普已受到伏地魔的控制，并告诉哈利要他设法保护每一个斯内普不喜欢的孩子。邓布利多与哈利来到一个洞中。就在这个洞中，邓布利多受重伤，正在此时斯内普突然出现，竟用魔杖将校长化为灰烬。目睹这一切的哈利，在伙伴的帮助下，杀死了斯内普，斯内普临死时吼出了自己就是混血王子的惊天秘密。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:敬文哥回来了，泥鳅自然也回来了，现在是不是已经拜堂成亲过了，洞房花烛过了呢？正恍惚间，就听玄龟问道：敬文哥，泥鳅可中了？可回家来了？我走的时候，我三叔正等着他回来办喜事哩，可回来了？急切之下，他一连问了好几个问题。