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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:Document Language: Simplified Chinese板栗道：可不是。The division of the three worlds was not only the basis for formulating foreign policies at that time, but also an important guiding ideology that had an impact on China's diplomacy for many years to now.CW的《#地球百子# The 100》第五季才播了2集，电视网就续订了第六季。NBC宣布一口气续订《#芝加哥烈焰#ChicagoFire》三季。1924年秋，冯玉祥北京政变，御厨赵亮邦和师兄弟董家瑞、关少则被掳掠到奉系军阀的兵营做伙夫，几经波折逃出生天，师兄弟三人从此走上了不同的道路。赵亮邦回到苏南老家开淮扬菜馆，没过多久却因“通共”的罪名被二次充军，在那里遇到了师兄董家瑞，后又被红军俘虏，与小师弟关少则重逢，很快，赵亮邦回到了家乡。1937年南京大屠杀后，日军设庆功宴，师兄弟三人摒弃前嫌合作策划了宴会毒杀事件，但亲人却惨遭报复，妻子、父亲惨死，赵亮邦家破人亡。面对处于不同阵营的董家瑞和关少则的对立，看着他们为不同的信仰而战，赵亮邦一度束手无策，但历经战火洗礼，他终是在共产党人的指引下弃厨从戎，带着坚定的信念投入到革命洪流中去，并成为一名坚定的共产党人。