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1. There are two options to manage the creation and destruction of state objects. The first is to create and then destroy state objects only when they are needed, and the other is to create all state objects from the beginning and never destroy them. If the state object is relatively large, the first method can be used to save memory, which can avoid creating some objects that will not be used and recycle them in time. However, if the state changes frequently, it is best to create all these state objects in the first place, and there is no need to destroy them, because they may be used again soon.刑警队铁血冷面的副队周海龙屡破奇案，新警员顾胜男睿智机警却缺少经验，在侦破一起有关胡教授和稀土样本案件时，两人层层剥茧，终于锁定犯罪嫌疑犯罪份子“屠夫”团伙，却因胡教授之子小宝被“屠夫”绑架，生命遭遇生死威胁，导致案件更困难。由于顾胜男破案心切，不料中计，幸亏周龙海及时营救，并识破“屠夫”诡计，两人将计就计成功抓获了犯罪团伙，保护了胡教授和样本的安全。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低声对秦旷道：世子，张姑娘今儿没去铺子。2002年 ルパン三世EPISODE:0ファーストコンタクト EPISODE:0初次交锋《我是僵尸》讲述一位变成僵尸的医学院女学生。为了能获取足够的大脑食用，以维持其基本的人性，主角找到了一份法医的工作，但她却被迫继承了这些被她吃掉的大脑中的回忆。在她的医生和一位警探的帮助下，她成功的解决掉了数起谋杀案。而随着这些案件的解决，也让她脑中那些恼人的噪音慢慢安静下来。Although she often suggests others to sign the marital property agreement, she did not sign it herself.