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一战德军王牌飞行员“红男爵”Manfred von Richthofen的故事。 他是一名德国飞行员，被称为王牌中的王牌（ace of aces）。他也是战斗机联队指挥官和第一次世界大战击落最多敌机的的战斗机王牌，共击落80架敌机之多。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.板栗抱怨道：太后也没多赏些，咱们家美女多。这样走，要走到啥时候哩？一边抱怨，一边往河边走。As a result, we can certainly imagine that what we did at that time was not professional, and Push was much slower than the professional information platform. After all, we did not have a fast mechanism and backstage.这不比买来的东西强？板栗听了大喜，忙起身拽着葫芦道：走。