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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　　故事围绕着一对年轻的白领夫妇肖逸夫（佟悦饰）和白韵琴（黄芳羚饰）展开，同时穿插了发生在肖逸夫的好朋友张威廉（刘春风饰）、金彼得（程皓枫饰）以及他的妹妹肖莎莎（李姝饰）身上的诸多趣事，构成了一幅妙趣横生的生活喜乐图。1. Direct attacks《道德经》里说‘贵以贱为本，高以下为基，所以帝王们喜欢用‘孤‘寡来自称，这就是以贱为本了。When we create an object, we always new an object. Is there any mistake? Technically, there is nothing wrong with new. After all, it is the basic part of C #. The real prisoner is our old friend "change". And how it affects the use of new.林朵渔、纪琴、颜樱是大学同学，她们曾经分别拥有过幸福，却都在三十岁这一年，因为生活观念、孩子、价值观不同步等原因，婚姻出现了问题。林朵渔和前夫都忽略了感情沟通，事业上的不同步更让他们变得生疏；纪琴的前夫不懂协调寡母与妻子的关系，家中有了婆媳矛盾；颜樱婚后一意孤行不愿要孩子，丈夫出轨，离婚后，她与前夫的感情藕断丝连。三位“前妻”经历着风雨，也实现着成长。对她们而言，最难过的莫过于前妻这个身份，但也正是这个身份成就了她们。她们顽强地走出因为婚姻失败带来的自我否定的困境，还积极地开始新的生活：林朵渔与前夫在长辈的撮合下重新得到了理解；颜樱与前夫正视了彼此斩不断的感情，携手解决难题；纪琴也找到了作为事业女性的存在价值。面对生活的重击，她们找回了幸福。7. The production space of the micro kitchen will give full play to the operating functional area of the store to a great extent and increase the ratio of floor efficiency.