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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.青天大人，小人冤枉啊。《绿箭侠第六季》（Arrow Season 6）是DC娱乐和华纳联手CW电视网制作的动作冒险类电视连续剧，是美剧《绿箭侠》系列的第六季。然后画面一转，一条草木丛生、荒废已久的旧道上，一辆破旧的马车快速行来，驾马的是一个身穿粗布衣服，神情焦虑，相貌俊朗的青年。1. Practical Website二十世纪九十年代，一座古老的四合院里生活着早年丧夫的谢玉锦和她的儿女们：少年朱元璋自幼贫寒，却为人正直勇武。元至四年， 淮北蝗灾甚重，其父不治而亡。为葬父而自卖其身，至马员外府放牛抵债。其间与马府小姐暗生爱意，后遭马府奸人嫉妒，无奈中只得出家为僧。不料命途多舛，在皇觉寺又遇恶僧，再次出走。师父海颠告其可投奔隐士刘伯温，以谋大计。不久，皇觉寺惨遭不测，寺破僧亡，朱元璋只身投奔濠州义军。义军头领郭子兴心胸狭隘，嫉贤妒能。经多次较量，朱元璋摆脱郭子兴，被众将士推举为帅，又联手天下贤人刘伯温，举起义旗。