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OCP (Open-Closed Principle) principle emphasizes that a software entity (class, function, module, etc.) should be open to extension and closed to modification. That is, every time there is a change, the behavior of the existing type should be enhanced by adding new code instead of modifying the original code.十年前，卡莉、斯宾塞和弗雷迪退出了一部最具标志性的电视剧，他们在20多岁时面对生活的不确定性，重新开始了人生的新篇章。I said, "Yes, I am trying my best, but I have wasted decades!"　　但看似简单的杀人案背后却隐藏着惊天的阴谋：凶手谷子丰在案发前曾伙同路长明利用电脑网 络窃取银行数亿资金，但帐号及密码只有谷子丰一人知道，为了得到这笔赃案，路长明必须在最短 的时间里，颠倒黑白，扭转乾坤，营救谷子丰。1920年代，上海滩表面繁华无比，实为列强的权力角逐场，大量文物走私海外。一个名叫“罪美人”的侠盗组织自愿担负追讨文物的民族大任，仇弟是组织的王牌，武功高强，历次出击中从未失手。Using the service provided by the victim host or the defects in the transmission protocol, the victim host repeatedly sends out specific service requests at high speed, which makes the victim host unable to process all normal requests in time.