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That is to say, the less a class knows about the classes it depends on, the better. In other words, no matter how complex the dependent class is, the logic should be encapsulated inside the method and provided to the outside through the public method. In this way, when the dependent class changes, it can minimize the impact on the class.一名警察在经过内部调查后被停职，他在全国各地游荡，寻找自己的网恋对象。Think about whether we can expand and draw inferences from other examples.娜英热心地讲解着自己负责进行的项目。娜英独自一人工作到很晚，把好友兼公司同事石顺，还有后辈恩善约出来一起去蒸汗房聊天，消磨午夜时光。二十多岁时忙得连桑那浴都没有去过，三十多岁的年纪一头钻进滚烫的蒸汗房热气里，有说不出来的舒服。此时，唯独二十多岁的银善充满活力，正在反反复复认真做着瑜伽动作。[Extension] Wuxi Enterprise's First Certificate: Free; One household with multiple certificates/foreign enterprise certificates: 150 yuan/sheet/yearIn this way, the implementation class of the Targetable interface has the function of the Source class.Then the next step is very easy to say.