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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 Encyclopedia4 View EventsAn obsessive psychologist attempts to reprogramme her subconscious mind, but when her actions become increasingly uncharacteristic she fears her experiment is dangerously out of control.资讯图表和档案画面交织出一个个历史小胶囊，讲述各式科学突破、社会运动及改变世界的重大发现该剧改编自若花燃燃的职场小说《苏筱的战争》，以建筑行业为背景，紧扣职场进阶和逆袭这一脉络展开剧情，讲述了造价师苏筱（孙俪饰）因合作方推诿事件而被迫离职后，机缘巧合下进入赢海集团子公司天成建筑，在高压又精细的造价工作中，即使面对公司内的暗流涌动和天科建筑经济师夏明（赵又廷饰）的强劲挑战，依旧秉持着“造价表的干净就是工程的干净”的职业信念，在一次次的激烈竞标中脱颖而出、也在一次次的斗智斗勇中经历职场的历练和洗礼，终于迎来事业的高光时刻和对人生理想的新感悟。1945年，第二次世界大战结束，日本侵略者也退出了这片被他们蹂躏长达八年之久的古老国度。然而黎民百姓却未盼来久违的和平，国共两党随即展开了新一轮的政权执政。这些副将军十分害怕开战，他只要再施加些压力，就能令他们屈服。