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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 Baidu5. QC and red lotus are directly released once cooling is finished;Deliberate practice takes place outside people's comfort zone and requires students to continuously try things that are just beyond their current ability.该项目看到基根迈克尔基和乔丹皮尔在直播室观众面前取笑一个主题编织在拍摄的短片和素描之间。今日虞子期的意思很明显，和谈不能再这边无休止地拖延下去，必须尽快有个结果才是。该剧围绕两代人之间错综复杂、恩怨交织的爱情故事缓缓拉开序幕。在波纳维斯塔庄园，年轻的侍女伊娜和少爷安吉罗坠入爱河。身份的悬殊注定了两个人的爱情困难重重。他们的相爱也同时揭开了一段鲜为人知的尘封往事，伊娜的生母阿摩尔曾与波纳维斯塔庄园的少主埃多瓦多相爱，却被埃多瓦多的母亲波尼塔拆散。阿摩尔生下女儿伊娜后奔赴美国，小伊娜在菲律宾却遭遇天灾，侥幸生还后被收养。命运流转,伊娜成年后又回到波纳维斯塔庄园，她与安吉罗之间产生了感情，主仆之别加上血缘谜团使两个人的情感之路困难重重。有情人能不能走到最后？上一辈纠缠的爱恨情仇又将如何化解？Eggplant secret medicine