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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吐气如兰，轻声道：阿里大人，陪本公主去花园逛逛可好？又咬牙用细若蚊蝇的声音道：你要想见青鸾公主，就单独跟我走，让这些侍卫们都退下。她便细细地告诉板栗等人，她是如何被金家收留，如何被勒死，又如何在丢进河以后苏醒过来，一直到跟着惠灵回到慈安寺等经过。　　李玉梅识破马家辉和孙殿起设下的消灭游击队的陷阱，秀英和惠珍这才相信李玉梅。三位女共产党员成立了党小组，坚持斗争，抓住了马家辉的狐狸尾巴。在最后一次斗争中，李玉梅为掩护党的通讯员小程，挺身而出，英勇就义。苏赫和涩琪在高中时代相遇，约定好要考上同一个大学，再续青春的情谊，大学时代，苏赫爱上了漂亮大方的珍儿，而涩琪.. 和珍儿居然相爱了... 三个人的命运和爱情纠缠在一起，他们会有怎么样的结局呢？本剧将镜头对准了一个普通的中国离婚家庭，讲述了在中国现有的家庭结构和道德伦理传统之下，离异夫妻所必须面对的具有“中国特色”的“剪不断理还乱”的诸多问题。记录了男女主人公背负着第一次婚姻留下的伤害与负担，围绕着复婚与各自的再婚、老人与子女、家庭与事业的种种矛盾冲突而演出的一段可咀嚼的人生故事……