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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也有能力做好为人老公的准备，谁料相亲遇到“拜金女”陷阱，差点倾家荡产！邓家齐、苗知喻、蒋鹏飞开始反思，原来，“尽责任”并不是一句空话，是要付出实际行动的，家齐、苗子、大鹏开始各展所长，逐渐摆脱“青春期”蜕变成熟，努力挑起生活的重担。从小哥哥背着她靠给人吹喜丧乐度日，后来还供珍珠上了艺专，可是一次意外使让珍珠不得不辍学，所以她对这个不成材的哥哥毫无怨言，每次都是倾囊相助。为此，她被歹人侮辱，被别人笑话，她求哥哥改邪归正，可是每次元宝都有一堆的理由说服她，珍珠也只能无条件地妥协。　　华莉丝在街头邂逅了收留自己的玛丽莲，跟着又在打工的餐厅里遇到伯乐，最终被发掘成为世界名模，并投身于妇女解放事业。Simplified Book ID: @ I don't have three heartsCharm 8:15 001 AboveNetflix青春喜剧剧集《保姆俱乐部》宣布续订第2季，将继续聚焦中学少女们的创业故事，探索来自不同背景、有着不同性格和观念的她们的友情、成长和人生。