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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 EncyclopediaUSA热门剧《妙贼警探》放出了第2季首支宣传片。这部最令人期待的剧集得到了诸如“时髦的”、“完美的”、“有趣之极的”等评价。就像最后Peter的台词一样：“这可不算完。”是的，这才是《妙贼警探》夏季攻势的开始。寡人这就给彭越写信，让他们从后面出兵袭扰项羽。能帮我吗？”主要讲述了标本管理员邹启之因为里岛盲鱼标本损坏，不顾台风将至匆忙上岛，然而刚一上岛便遇到了木箱杀人事件。与此同时，岛上的实习警员王子轩不得不临危受命，调查真凶，调查过程中命案再起……