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当夜，睡在船上，听着轻缓的江水流动、寒风吹得枯枝荒草簌簌响，镇上偶尔传来一两声狗叫，让大家感受到不同于大城镇的氛围。就着摇曳的灯光，再一次打量正跟弟妹们谈笑的大儿子，李长明两口子如同做梦一般。悬崖边上的魔术师和不健康的恶魔姐姐的王道幻想开幕！汪晴，事业有成、家庭美满的女强人，丈夫尹剑平和好友胡莉的背叛打破幸福的假象，女儿豆豆又被查出和剑平没有血缘关系。为证明自己清白，汪晴坚持不离婚，带着豆豆离开尹家。为了追查真相，汪晴吃尽苦头。职场又遭人诬陷，被迫离职，开起餐馆，结识大涓与小志母子。彭娟临终把小志托付给汪晴。餐馆经营艰难，汪晴陷入困境，旧爱周凯文施以援手，餐厅转型重新出发。胡莉怀孕，汪晴不忍心孩子没有爸爸，遂同意与剑平离婚。剑平事业出现危机，胡莉意外流产，关系紧张...她将如何度过难关？《购物街》是由中央电视台财经频道推出的一档大型演播室互动娱乐节目。现已暂时停播。（节目正处于创新改版阶段）中国邮政集团公司发行的幸运卡是参与《购物街》节目的唯一报名方式，全国各地邮政营业网点均有销售。3. The reusability of the algorithm is poor. If another form is added to the program and this form also needs some similar validation, then we may need to copy the code again.The Liskov Substitution Principle (LSP) is one of the basic principles of object-oriented design. The Richter substitution principle says that wherever a base class can appear, subclasses can certainly appear. LSP is the cornerstone of inheritance reuse. Only when derivative classes can replace base classes and the functions of software units are not affected can base classes be truly reused, and derivative classes can also add new behaviors to base classes. The Richter substitution principle is a supplement to the "open-close" principle. The key step to realize the "open-close" principle is abstraction. The inheritance relationship between the base class and the subclass is the concrete realization of abstraction, so the Richter substitution principle is the specification of the concrete steps to realize abstraction. --From Baidu