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Liskov Substitution Principle, LSP (Richter Substitution Principle) means that subclasses must replace their parent types. In other words, in the process of software development, after the subclass replaces the parent class, the behavior of the program is the same. Only when the subclass replaces the parent class and the function of the software is not affected can the parent class be truly reused, and the subclass can also add new behaviors to the parent class. In order to look at an example of violation of LSP principles, the specific code is as follows:Link to this article: Scratch2.0 Programming Tutorial Section 6: Event Module被描述为一部关于爱,欲,和满足的喜剧片。讲述艾玛·汤普森饰演的55岁寡妇NancyStokes迫切渴望冒险,人类联结和性,渴望她人生中第一次很棒的性爱。丈夫Robert给了她住宅,家庭和看起来像样的生活,然而他已经走了,如今Nancy觉得连有些修女都比我性生活更丰富,她一向是行动派,且当过老师,相当有条理,于是她马上开始实施计划：做了一些研究之后,Nancy雇佣了一个20岁出头的男妓LeoGrande（或者如Leo自我介绍是性心理治疗师）,准备享受一晚上的极乐。　　从Closer发展出的衍生剧，没想到该走脉脉温情路线后仍然凭一票老戏骨演员撑起了此剧，不是大红大紫，但让人看了温暖。你是否也曾经历过，爱情中惯性被打破：煎熬的异地恋，或是突如其来的“被分手”。