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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:Memorandum mode:电视剧《都是一家人》在中国最后一个“原始部落”云南阿佤山翁丁佤寨顺利开机，开机仪式由边疆各族群众自发举办。本剧由林永健 主演，作为首部描写城市民族生活的电视剧作品，该剧讲述了各族同胞为改革开放做出的贡献和为美丽中国增添的时代光彩。《触及真心》是一部政法题材浪漫剧,该剧翻拍自同名网络小说，讲述顶级女演员吴允瑞因为突然爆出和财阀三世的绯闻，事业开始走下坡路。她为了出演知名编剧的电视剧而到韩国最厉害的律师权政禄那里伪装求职当他的秘书。 描写被称为“韩国第一女神”的顶级女演员和很酷的律师之间的隐秘的办公室恋情，韩流女神伪装就业的浪漫爱情故事。Is there only one person? ? ) I thought a lot of people would like hiroki.