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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财顺是个不折不扣的“博士”，他精通赌术，也以赌博为生。他深信一个道理，要在江湖混，最好是光棍！所以，已经踏入30岁的他，仍然是条光棍！财顺出生在赌博世家，有个爱赌如命的老爸李开山，他自小就被老爸带在身边开赌档，耳濡目染之下，自然也对赌博产生了浓厚的兴趣。财顺有个弟弟叫财来，财来跟哥哥的性In fact, not necessarily. The poor who have been caught in a vicious circle for a long time will soon become poor even if they become rich occasionally. The National Bureau of Economic Research of the United States has conducted a survey: in the past 20 years, the bankruptcy rate of European and American lottery winners has reached 75% within 5 years.报亭老板当然知道有这种销量，是因为天启和紫月剑新书对决。只听韩信续道：所以越国最主要的威胁还是来自于闽越和东瓯。故事描述20多岁的年轻人Quentin（Jason Ralph）和Alice（Sosie Bacon）在纽约研究魔法时发现自己童年读过的「魔法奇幻世界」不仅是真实的，而且会给地球和人类带来一场灾难。被招募到一所秘密魔法学校后，一群学生发现，他们读到的魔法孩子是非常真实的，比他们想象的更危险。凡是涉及金钱利益，难免就会有罪恶的发生，在赌博世界中,出千行骗的情况真的多不胜数，受害者除了金钱损失外，有些人更会导致家破人亡，社会上需要一些人去帮助受害者同时，更需要一些人去对付那些万恶不赦的老千集团。而故事主角腾飞，凭其一身出神入化的千术和数位志同道合的年青伙伴，组成了一个反千组，四处锄强扶弱，不断向恶势力挑战，而故事首先发生在赌场林立的澳门，腾飞受人所托前往澳门某赌厅进行反千，怎料误中厅主江先生的诡计，利用他行骗一个内地的富二代。腾飞早着先机，一于将计就计，利用伙伴们的配合，先将富二代掉包，跟着与拍档一起反千江先生一笔，令他赔了夫人又折兵，而江先生的真正身份，原来是东南亚最大老千集的小头目，而他们的老大是一名绰号高先生的大老千，江先生设局失利，受到高先生的重罚，而高先生亦对腾飞留下深刻印象