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2. 5. Artistic Performance明军大惊，由大喜至大悲不过一线之隔，中间那条线就是一个大大的蠢字。I think that for today's him, the topic of the details of the battle at position 142 can also be stopped. I comforted him and finished the interview after a few words.胡宗宪望向此人，轻哼一声：何大学士也好此风雅？凡是新的，在下都好。最终，桃园行动组彻底覆灭。英王却站了出来，冷声道：童侍郎恣意妄为，滥用刑罚，摘了他的官帽，扒了他的官服，押入大牢，听候处置。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.