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State mode-Allows an object to automatically change its behavior when its internal state changes, and the object looks like it has changed its class. The specific structure diagram is as follows:普密斯很难决定是选择欲望还是职责，同时警方会处理相关手续。Visitor mode is to encapsulate some operations applied to a certain data structure. Once these operations need to be modified, the data structure that accepts this operation can be saved unchanged. Visitor mode is suitable for systems with relatively stable data structures. It reduces the coupling degree between data structures and operations acting on data structures, making the set of operations relatively free to change. The specific structure diagram is as follows:民国十四年以后，从英国留学归来的纨绔公子路垚凭借其超高智商和推理能力，被身手不凡的巡捕房探长乔楚生邀请做探案顾问，之后二人又携手正义感爆棚的女记者白幼宁组成侦探小分队，侦破了一个个看似诡谲蹊跷的命案，性格迥异的三人在乱世中坚守正义，维系社会安定。我觉得……咱们不用计较这个。　　张娜拉饰演罗政善，她是VIP顾客小组次长，外表开朗愉快，但有着不为人所知的痛楚。她和同一组的组长朴成俊结婚并组建了家庭，但因为无法预知的事件人生崩塌。