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绿叶第五季……不然，好好的谁想吃它。在香港街头，一群人在听一个说书人讲故事。一辆警车开来，以妨碍交通为名将说书人带回警局。有两个人为了继续听故事而跟警察动手，为的是能和说书人一起被带回警局。说书人说的是多年前一个著名的粤剧编剧南海十三郎的故事。十三郎生于广东南海，在家中排行十三，父亲是江太史公。在一次慈善舞会上，十三郎对上海女子莉莉一见钟情，并追随其到上海，但莉莉对他并无好感。别人反叛项羽完全在意料之中，九江国就有些让人觉得意外了。听了这话，虎子和黑娃都沉默。The process of solving crimes: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.