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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:孪生姐妹紫兰和百合因种种误会成为陌路人，六十年后，因为百合的女儿需要换肾，两人又重新走到一起，多年的误会消除了，善良的人们在真情的付出中得到了幸福的回报。CMD (Common Module Definition), in which a module is a file.徐阶默默起身，遏制住瞳中的泪水。她看着小闺女感叹，三个女儿中，红椒就不说了，是个直脾气。However, some people, together with the "correct" arrangement of the old people, and some "strange" mental states and behavioral phenomena mentioned above due to brain dysfunction, said that people can really anticipate death, and named a special term, Nearing Death Awareness.无惧风浪；勇往直前！　　这五位少女投身社会后，虽然分别在事业、家庭、爱情，以及婚姻各方面遇上重重挫折，但她们凭着坚毅不屈的精神、加上五人互勉，终于战胜困难，实现理想。