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3.2SNAT: Source address translation solves the problem that intranet users use the same public network address to access the Internet.If I were to implement a pizza ordering system, I would definitely write the code like this, because this kind of code can be written subconsciously without consuming our brains. However, take a closer look at this code: the purpose of this method is to order pizza. However, the code for ordering pizza also needs knowledge about the production of pizza. This method must know all pizza. Worse still, if the types of pizza are to be expanded or pizza with poor sales volume are to be deleted in the future, then the code for ordering pizza will be modified. It looks very bad and should be revised. Our first step must be to separate the code for producing Pizza from the code for ordering pizza, because you should not let the code for ordering Pizza know the logic for producing pizza, but should hand over the logic for producing Pizza to a special type. In this way, we can cope with future changes-if we want to add or delete pizza, we can directly modify the producer of pizza without affecting the logic of ordering pizza.所以这次闭关，张三丰便是为了创出一门绝世武学——《太极功》，立武当百世基业。该剧讲述了上世纪三十年代一个大家庭中，围绕一份藏宝图而引起的一系列离奇事件。故事发生的脉络涉及到日本、军阀、湖匪等立体历史背景，故事的立意更是深邃，不但宏扬了以文康为代表的国人的拳拳爱国心，更客观审视了国人固有的特性——如麻将馆里的桌桌麻将，四人为一组，亦敌亦友、相生相克……在一个大家族中，老爷死了，留下一份神秘的藏宝图，四个太太各怀心事，每个人手中都掌握了一句诗，唯一找到藏宝地点的方法就是把四句诗合在一起成为七言绝句，但是每个人都想独吞宝藏，特别是为此费劲心机的日本人……一位单亲母亲，带着一儿一女(“汤姆·里德尔”弗兰克·迪兰和艾丽西亚·戴伯南·凯瑞饰)，联手男主肖恩(克利夫·柯蒂斯饰)一起末日求生。剧集故事发生的时间与《行尸走肉》第一季相同，不过故事发生地在洛杉矶。