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二姐姐性子直，能很快丢开手，这未尝不是件好事。　　在生与死面前，仅剩的六名姐妹最后看了一眼深爱的大地，手挽手，拉响了手榴弹。你再不走可就真没命了。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电话那边直截了当的说道。姜贤世是个没有梦想，没有明天的黑社会的成员。突然有一天，他的面前掉下一个遗产－－幼儿园。黑社会和幼儿园，世界上不会有第二个这样不协调的组合吧？这个幼儿园里有一个与姜贤世处处对立的女老师俞未来和严肃的监管老师高阿拉，还有一群可爱的小朋友。周边更有时刻盯着幼儿园的父亲和黑社会的老大。 姜贤世和他们之间到底会发生什么样的故事呢？到底母亲留下的伟大的遗产是什么呢？只是一所幼儿园吗？