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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:上世纪八十年代初，一对异卵双生的姐妹降生在宁康小镇的卫生所。先出生的姐姐被父母抱回了家，取名路桐，后出生妹妹被父亲路强遗弃在了卫生所，帮助接生的大夫陈锦芳和杜宇国把她抱回了城，取名杜小馨。路强因为生活不顺利，经常醉酒回家，对路桐母子常常是拳脚相加，母亲邱雅丽为了路桐能够安稳地生活，并顺利上学，她带着路桐一起逃到省城，投奔亲友。路桐和母亲相依为命，生活虽然清苦，但他们生活得很平安。直到得了绝症的路强怀着满心的忏悔，带着和路桐同父异母的弟弟石头来找雅丽，雅丽这才知道原来自己还有一个女儿。在城里生活的杜小馨自小过着无忧无虑的生活，一路顺风顺水地考上大学参加工作，生活中任何的磨难似乎和她没有任何关系，她的前途一片光明。然而，此时路桐却因为父亲的离世，母亲意外重伤，不得不放弃上大学的机会，担负起整个家庭的重任。但这一切并没能消磨路桐的意志，反而让她变得更加的坚强，母女俩相互鼓励，坚强地生活着……路桐为了照顾母亲，维持家用，四处打工。她也并没有放弃自己的追求，终于凭着努力获得了电大的文凭，因为品学兼Activity monitor is a device that can detect and interfere with traffic to the server. Like firewalls, it is not a necessary device in network routing. A typical monitor, like the ACK disguised firewall/proxy in 7, has an additional capability, that is, if it finds that the SYN packet originates from an attacker source address it knows, it will immediately send the disguised RST packet to the server. Activity monitors are practical because they are cheap and easy to deploy (compared with schemes based on firewalls and input source filtering), and can still protect the entire server network without requiring each server operating system to implement a terminal-based solution.俩个戴帽子的多爪软体动物该剧由前《爆笑办公室》（The Office）编剧兼制片人Ruben Fleischer开发，America Ferrara和Ben Feldman主演，故事描述一家超级广场店的员工们的爱情、友谊和每一天经历的美好时刻。这里有天真的新人、见惯不怪的老手、毫无工作经验的夏季临时工和干了一辈子的经理，他们将共同应对狂热的「讨价还价猎人」（购便宜货上瘾的人）、容易引发骚乱的促销活动和令人昏昏欲睡的业务训练课。Alice arrives unannounced at her estranged brother Ethan's house in an attempt to reconcile, but bizarre visions, the return of his strange girlfriend and Alice's paranoia and suspicion force the siblings to cling onto reality amidst mysterious circumstances.