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Visitor pattern decouples the data structure from the operations acting on the structure, making the operation set relatively free to evolve. Visitor pattern is suitable for systems with relatively stable data structure and easy change of algorithm. Because visitor mode makes it easy to increase algorithm operation. If system data structure objects are easy to change and new data objects are often added, visitor mode is not suitable. The advantage of visitor mode is that it is easy to add operations, because adding operations means adding new visitors. Visitor mode centralizes the relevant behaviors into one visitor object, and its changes do not affect the system data structure. Its disadvantage is that it is difficult to add new data structures. -From Encyclopedia抗日战争时期，日本制定了一系列恶毒的计划，妄图陷害中国的抗日将领，企图发动太平洋战争，并暗地里寻找中国的铀矿资源，为制造原子弹做准备。打入敌人内部的袁飞，被组织怀疑为叛徒，他利用聪明才智证明了自己的清白。他和在他解救之下加入共产党的江湖侠女欧阳文，国民党军统上海站领袖申剑，以及来自苏联和美国的世界反法西斯联盟的特工们并肩战斗，破坏了日军的“920计划”、“海计划”，并最终取得了日军制造原子弹的4285秘密档案。欧阳文在执行任务过程中发现了自己的身世。她与自己的生母，化名梅若兰的日本特务刀枪相对，国恨家仇与骨肉亲情的痛苦抉择中，欧阳雯毅然选择了民族大义，却遭到梅若兰的枪杀，壮烈牺牲。袁飞最后也将隐藏在共产党高层潘和平身边的日本特务“华广奇”就地正法。唔……那，金明，你就讲一讲吧。(1) We are now writing a work log every day, writing down the daily work records and the problems that have occurred and solving them truthfully, and writing down the weekly work summary.In real life, there are many intermediary modes, such as QQ game platform, chat room, QQ group and SMS platform, which are all the applications of intermediary modes in real life.尹旭轻咳一声，喊道：伯洲。