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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平凡的世界中，两人的相遇是缘，但爱并不是一帆风顺的，爱也不只是两个人独自拥有的。夏一平为他的初恋情人钟千惠即将成为他哥哥夏一哲的妻子而烦恼的时候，一个活泼可爱的女孩司马凝露出现在他面前，司马凝露与夏一平的相处中，两人成为一对欢喜冤家。而钟千惠因为夏一哲的冷落，准备再次回到夏一平的身边，两对两个女孩的感情，夏一平会做出怎样的先择呢……各人住哪都安置妥了？张槐轻声问小葱道。Example example=new Example ();范增注视着项羽，郑重道：成大事者，就要有非常之性情，要懂得忍耐，容忍。两人都翻身上马，往前疾驰而去，红椒洒下一串清脆的笑声。《还我正义》（Leverage）是一个现代罗宾汉的故事，故事的主人公Nate Ford曾当过保险调查员，为自己的老板挽回过数百万美元的损失，是个忠心耿耿的雇员。但是有一天，他发现老板宁愿让自己的儿子去死也不肯兑现理赔，意识到自己与这个虚伪的行业根本就格格不入。辞职之后，Nate Ford戒掉了酒瘾，与另外四个各具神通的人组成了一个小团队，发誓保护那些受到社会与强权主义压迫、得不到公正待遇的人。这四个人是：Parker－－盗窃专家；Alex Hardison－－互联网与计算机专家；Eliot Spencer－－不费吹灰之力就能徒手对付一大群敌人的壮汉；Sophie Devereaux－－职业骗子，骗人的表演技术足以赢得奥斯卡奖。