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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:Q: Which sub-area of machine learning do you pay most attention to?Memory shutdown!江湖不平事颇多，单凭手中一柄剑，何以忘忧遇真情？赵丽颖、林更新全新古装剧《忘忧镇》10月即将震撼来袭，带你揭秘醉梦江湖、一见忘忧。唯美飘逸的古装、充满波折的感情线，究竟赵丽颖与林更新能否突破《忘忧酒馆2》时的那段苦情命运，真正地做到江湖忘忧、携手与共呢？NBC宣布一口气续订《#法律与秩序：特殊受害者# Law & Order: Special Victims Unit》三季（22-24）。Our App is used as launcher by Android as the system application task stack, so it is not displayed.在经典的童话故事里，如梦如幻、色彩斑斓的天马之城，英俊的飞马王子（郑恺 配音）即将迎娶美丽的蓝马公主（白百合 配音），谁知婚礼现场却被抢婚的小矮马（刘红韵 配音）所破坏。飞马王子在追逐小矮马的时候遭遇意外，坠落到了青青草原。与此同时，草原上这个经典童话的结局也发生了改变。为了让痛哭流涕的大人们重新振作起来，也为了帮助飞马王子找回真爱，喜羊羊、美羊羊、懒洋洋、暖洋洋、沸羊羊以及小灰灰拿到了村长发明的飞行套装。在那个皓月当空的美丽夜晚，他们与王子一同飞上天空。在此之后，灰太狼和红太狼也紧随其后出发。