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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白沙寨霸气女土匪白云凤（彭雅琦饰）带领陈大碗（任羽饰）及众兄弟妄图劫持骠骑将军送给户部尚书的生辰纲，却偷鸡不成蚀把米，被骠骑将军“一锅端”后抓入将军府，在即将被杀头之际，阴差阳错地被骠骑将军谈和，化名“陆婉儿”，一跃成为将军府二少夫人，误打误撞结识了自己的契约夫君皇甫曜（高梓添饰），开始了一场轰轰烈烈地甜爱之旅。《张玉贞，为爱而生》为韩国SBS电视台古装电视剧，剧本根据同名小说及朝鲜时代著名历史人物禧嫔张氏（张禧嫔）的生平改编而成，讲述这位朝鲜历史上著名的“妖妇”如何从普通宫女破格获封为妃，独占朝鲜肃宗的宠爱于一身，最后却又因宫廷斗争而被赐死的跌宕起伏的一生。剧集与以往不同，不带惯性的偏见或者刻意的褒扬，而是以更现代的视角、更人性化的观点剖析张禧嫔。淡化了政治斗争的倾轧与偏见，而着重以女性视角剖析主人公的性格及命运，以从朝鲜针房（司针房和补艳署）侍女成长成为朝鲜时代的时尚设计师为线索，描写张玉贞作为一个女人而非政治人物的情感纠葛以及她个人对朝鲜服饰和化妆技术上的贡献，从她与肃宗的动人爱情故事及生活经历中体现出女性的自尊和梦想。重新演绎了这位传奇女性跌宕起伏的一生，再现了她所生活并炽烈热爱的朝鲜的“文艺复兴”时期。6? Countermeasures of Network Terminals11世纪的东欧，整个欧洲正处于北欧维京人肆虐的时代。无尽的村庄、城市被灭绝，而身为主角的一群年轻杰出的勇士发下誓言维护正义，他们到处打击维京人。本片通过大量的打斗、古装战争场面的描述，再现了史诗般恢弘的战役，让观众牢牢记住曾经的英雄。Lin Huiyin passed the Jiangnan Xieyuan examination, and Lin Ruhai hesitated. To be honest, he doesn't want his son to take part in this Spring Festival at all. Because he knew that his son was too young, that is, the coming year...Only by changing the organization code needs to be unbound in the communications department system and then the CA is re-bound. Other content changes do not need to be untied.