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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:和第一集一样，故事中的两位正面角色仍旧是香港的李警官（成龙饰）和美国联邦调查局的侦探詹姆斯·卡特（克里斯·塔克饰）。卡特和洛杉矶警局正在追捕一个恐怖份子，这名恐怖份子正在设法离开洛杉矶前往香港。李警官和香港警察局也正在追捕一名恐怖份子，而他正在设法离开香港前往洛杉矶。在调查中发现，这两个恐怖份子原来是同党，他们分别在洛杉矶和香港设置了威力巨大的炸弹，并以此向当局索要大量钱财，如果当局不能在规定时间前向他们支付这笔款项，他们将选择在交通高峰时段同时在香港和洛杉矶引爆炸弹。I downloaded an ISO file from my computer to show you that it is not suitable for physical CD-ROM, and it is also possible to browse resources if it is not suitable for CD-ROM!乾隆末年，颁诏赐婚，将十女”和孝公主”许配给”和珅”之子”丰绅殷德”，并册立十五皇子”永嘉庆君琰”为备位储君，佞臣和珅担忧永琰登基后会对他不利，遂决定除去永琰这眼中钉。 ”台熙（金芝禾 饰）和善宇（金贤珠 饰）两姐妹的父亲本事富家子弟，因为不顾他的父亲反对亲事而和妻子一起出走，妻子在产下善宇后撒手人寰。父亲带着在两姐妹贫困度日，在台熙14岁、善宇9岁时父亲查出患了癌症，得知自己不久于人世后，父亲去求自己的父亲照顾这对姐妹，不料话还没出口就被赶了出来。父亲在回来的路上出了交通意外身亡了，台熙和善宇打算来汉城找爷爷。不料在车站时台熙因为追赶偷了钱包的少年张在赫（韩宰锡 饰）而与善宇失散了，随后张在赫在台熙爷爷寻找她时获知她是富商的后人，于是带着台熙找到了金家。随后台熙和在赫都被祖父送到了美国读书，而善宇被当年撞伤她的货车司机收养了，过着清贫的日子。台熙学成归国后，一边打理金家的事业，一边开始派人四出了找寻当年丢失的妹妹善宇……In fact, each design pattern is a very important idea, which looks very familiar. In fact, it is because what we have learned is involved. Although sometimes we don't know it, it is actually reflected everywhere in Java's own design, such as AWT, JDBC, collection class, IO pipeline or Web framework, in which design patterns are everywhere. Because of our limited space, it is difficult to talk about every design pattern in great detail, but I will try my best to write down the meaning clearly in the limited space and space so as to make everyone understand better. If there is no accident in this chapter, it should be the last talk of the design pattern. First of all, it should be the figure at the beginning of the previous article: