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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烽火传讯必然是已经到了问题非常严峻的时候才用的，有了周幽王烽火戏诸侯的的例子在前，谁也不敢轻易使用这东西。若是女儿真的嫁给了尹旭，那越王便是自己的女婿，也就算是半个范家人。1942年10月，日华北方面军派遣1.6万兵力扫荡在岳北部，据守沁源县城，企图以此为基地，分割蚕食太岳抗日根据地。为粉碎日军阴谋，八路军太岳军区主力与地方武装、民兵团结奋战，进行了一场艰苦卓绝的战领与反占领，围困与反围困的“沁源围困战”。在一群朋友的除夕晚会上，一系列疯狂的活动揭露了秘密，伤心了，并导致了令人震惊的结局。多行不义必自毙，胡家这是遭天谴了。就在战役即将开始之际，一架载有中国情报军官的盟军飞机失事，中国军队怒江战役作战计划和电台密码不慎落入日军滇缅情报机构“芒市一号”手中，日军滇缅情报机关头目岛田大佐采用欲盖弥彰手段，故意制造机毁人亡的假象蒙蔽我军指挥系统。