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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宋义半低着头，阴沉着一张脸，很不高兴。《我要一个家》讲述一个被爱拯救的故事。姐妹经历家庭惨剧，醉酒的爸爸被母亲推下楼摔成重伤。妹妹小露被领到了爷爷家，姐姐小雨在姥爷家长大。多年后长大的两姐妹努力让分裂的两个家庭重新融合。出狱的妈妈向多年卧床的丈夫忏悔，悲伤的两家人重新走到一起。姐妹俩经历了各自的爱情，小露与方一山这对有情人不被两家容纳，他们想用爱来粘合父辈的裂痕竟如此艰难！已怀孕的小雨苦苦等候心爱的人归来，想告诉他即使没有一分钱也将拥有真正的幸福！姐妹俩最终用勇气和包容不仅弥合了分裂的家庭，也有赢得了属于自己的爱。苏岸拍手道：如此甚好，绕道从南部的一些地方进入巴蜀。Exit flight simulator function刘氏气得笑道：分家？你想分啥？青莲认真地说道：我就分养鸡的竹园子。包头巾算什么事……老杨不以为然。