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The above is only a model of "Long En" bicycle, If you need to generate other types of bicycles, Other subclasses can be written. The most important advantage of factory mode is that some of the same methods can be implemented. We can write code in the parent class for these same methods. If we need to implement specific business logic, we can rewrite the parent class's methods in the subclass to implement our own business logic. In terms of professional terms, there are two points: First, weaken the coupling between objects and prevent code duplication. Instantiating a class in a method eliminates repetitive code. Second: Repetitive code can be written in the parent class. Subclasses inherit all member attributes and methods of the parent class. Subclasses only focus on implementing their own business logic.9-2 Three Restaurants: Create three instances of the class you wrote to complete Exercise 9-1, and call the method describe_restaurant () on each instance.历史已经走到了越王二年的年底，山阴城里一片繁华。小岛惠子发现抛弃自己的亲生母亲竟然是妓院里的妓女，感到十分羞愧，离开了养父母家，与一干小姐妹混迹于东京涩谷街头。但和母亲那斩不断的骨肉亲情却怎么也挥之不去，这血缘关系就如同锁链般，紧扣着她身边所有人的命运，她们既有摆脱不开的骨肉亲情，又有无法化解的矛盾与恩怨。　　在与邻里相处的过程中，在解决一件件鸡毛蒜皮小事的过程中，圆圆渐渐明白了百姓事无小事的深刻含义，也更加珍惜眼前的生活。《圆圆的故事》延续了16年前《我爱我家》的人物线索，还创新地借鉴了美剧拍摄手法，加入更多时尚、幽默、青春的元素。The summoners and his team who finally defeated the BOSS of Annihilation Eye hiding in the sandstorm center were the winners!旱地里种着小麦，田里种的是红萝卜和白菜等作物。