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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 EncyclopediaThe 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.《走出国门》讲述的是建工集团的建筑工人远赴非洲、柬埔寨历经生死、情感。勇于拼搏以及艰难而又辉煌的历程。该剧反映建筑工人们在踏出国门后的种种经历，以及在恶劣的环境和巨大的压力下，仍要肩负使命，完成任务的不屈精神。特七随即挥刀逼来。祝延平版《武松》通过“景阳冈打虎”、“兄弟话别情”、“斗杀西门庆”、“醉打蒋门神”、“身陷都监府”，“血溅鸳鸯楼”、“二进十字坡”、“二龙山聚义”这个8个小故事，将武松传奇而平凡的一生刻画的淋漓尽致，在他身上我们看到了什么叫“逼”——丑恶的社会在逼迫武松，让他好人做不得，他不得不杀人，当武松只有杀人这一条路可走时，杀人的标准也就不再象以前那么精确，而是模糊了，道德的约束也就随之瓦解了。原因无他。