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According to the basic structure of the code above, TeaAndMilkGirl is a sent object (here is milk tea sister); Ceo is the object of giving gifts. He has preserved the attribute of milk tea sister and has his own privileged method. SendMarriageRing is such a method of giving gifts to milk tea sister. Then he wants to finish the matter through his agent, so he needs to create an agent model of economic man, named ProxyObj;. The main thing he does is, Give the gift given to him by the ceo to the ceo's lover, Therefore, the object also needs to save the ceo lover's object as its own attribute, and also needs a privileged method sendGift, which is to give gifts. Therefore, the ontology object can be instantiated in this method. The ontology object here is the ceo sending flowers. Therefore, it is necessary to instantiate the ontology object and call the ontology object's method (sendMarriageRing).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 EncyclopediaA2.3 Collection of medical historyThe principle is to try to use synthesis/aggregation first instead of inheritance.战国晚期，秦赵争锋，战事迭起。赵国邯郸，御史李赫的女儿李皓镧因继母的陷害，家破人亡、身败名裂，甚至被卖出。遇不得志的吕不韦把她买下，用奇货可居的计谋将皓镧献给了当时在赵国皇宫当人质的秦王孙异人。李、吕二人一同入赵宫，凭智慧击退了种种阴谋，化解了公主雅因爱慕异人而对二人的陷害，受到赵王的青睐。皓镧下嫁异人，秦国坑杀赵军四十万，异人的质子身份让他生命受到威胁，公主雅陷害皓镧不成反丧命，让二人之间产生嫌隙。宫中人人自危，吕不韦利用皓镧挑起事端扰乱赵国内廷，借机带秦王孙异人逃离赵国归秦。秦国有奸人散播谣言说皓镧之子嬴政的父亲不是异人而是吕不韦。而此时异人病重不治，嬴政登基，认为吕不韦与父亲之死难逃关系，同时忌惮吕的权利过大而把他流放。皓镧请求儿子饶吕一命，最后俩人像相识的最初一样重会洛阳。嗷嗷叫得欢畅，满脸兴奋，与其说是追敌，不如说是在演兵，何风的前面更是跑着无数军士——哪能让何将军打头涉险啊。