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寻找心中的彩虹，憧憬彩虹另一边的美丽世界。Reference: Baidu Encyclopedia QQ Flying CarIf 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.其二，政治团体是有军事、外交、律法能力的，其中的差异大概就是地方总督与商队老板之间的差异。《流星》讲述为了让如夜空中星星般的艺人们发光发亮，在背后流血、流泪、流汗的人们的故事。? ? ? ? ---Failed, hint does not match docker-io version这日，最精锐的越国斥候军回报，发现闽越军踪迹，正在匆匆返回闽越故地。