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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何时江湖正道就剩下这点胆气？得知燕南天此行就是要去恶人谷，昆仑七剑皆是面露骇色，失声道：万万不可。The principle of rescuing the wounded is to save people first, and the principle of rescuing people is to stop bleeding first.MyDoSth+=new DoSthh (d1);只要换回女装，那便不怕了。天才少年画家顾夜白（陈若轩饰）创伤性心理疾病发作，眼里的世界失去了颜色。他正准备国际美术大赛金奖的画稿，变故令他十分焦虑。他偶遇阳光女孩路悠言（安悦溪饰），在她的帮助下慢慢调整心态，完成了自己的美术梦。可就在顾夜白和路悠言经历一段段磨炼，即将收获美丽爱情时，路悠言得上司赏识，获得了去巴黎的机会，而和她一样患病的表哥却传来了病危的消息，两人的爱情遭遇现实考验。除了爱情外，顾夜白、路悠言等这一群年轻人面临毕业的大四人生还有太多太多需要考虑的现实问题，社会充满了各种机遇，同时也有未知，年轻人们用青春的画笔书写着各自的心与灵魂。《摩登家庭》正式确定要完结了。