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Background information:美宝被男友抛弃后自杀未遂，巧遇中学同学海伦，海伦将她收留，并照顾、帮助她。然而，美宝却恩将仇报.There are also such ~充满热情的黄基俊（朴叙俊饰）和理论小天才姜熙烈（姜河那饰）同为警察大学的学生，也是好朋友。某日，两人出门时偶然遇到了绑架事件，遂立即按照学校教育的那样向报警。但是，由于警察局的工作流程太复杂，再加上证据不足，调查没有任何进展。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.