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小娃儿忙点头，再次追问道：像你姐姐那样的大家闺秀一定嫁给大官了吧？问完继续吃，第二碟黄鳝又见底了。对付匈奴人，他们主要擅长的是用骑兵弓弩的野战，而非长于攻坚。难道韩信会没有想过这个问题？一个兵法韬略高深的谋略家不可能不想能不仔细思考这些问题。　　灭门惨剧时，杨月产下一男婴，郑武要斩草除根，杨月恳求乔征将婴孩带出帅府，交给他人抚养。郑武为此使出毒计，如果没人交出郑家遗孤，就将所有的婴孩全部杀掉。夏林推门走了进来，在夏林的身后还跟着两个少女。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 BaiduThe only way to implement this interface is PhoneWindow. Then let's look at the source code of PhoneWindow: