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园艺师搬到新家被邻居男女主人同时爱上O记沙展天宝（林宝怡饰）在酒吧重遇了当日杀死妻子刑满释放的道友强，忍不住将打得他重伤入院。随后，城中富商纪中南（曾江饰）的独子彦祖（马浚伟饰）遭绑架，天宝在监视绑匪刘英勇的情妇石小玉时发现了他们收藏人质的地点，马上前往营救人质。匪徒在收到了赎金后得知了天宝正在前往营救人质，于是企图引爆炸弹将他和人质炸死，幸好天宝最后关头救出了彦祖。纪中南十分感激天宝，两人成了朋友。这日宝在差馆再遇道友强，借落口供又打了他一顿，岂料因此而被逼自动辞职。好友正杰（张兆辉饰）邀请天宝加入自己的保安公司，但天宝觉得不合适拒绝了。随后，天宝想自己做生意却又处处碰壁。这天，纪中南想请保镖，正杰知道天宝和他的关系，于是请天宝前往纪中南处为自己的公司作推荐。纪中南同意让正杰的保安公司负责，但条件是要天宝亲自负责安全工作。天宝无耐之下加入了正杰的保安公司，正式展开了他的保镖生涯。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 BaiduProcessing actions are called target in iptables (this is not accurate, let's call it that for the time being), and actions can also be divided into basic actions and extended actions.Factory method pattern refers to defining a factory interface that creates an object. Its subclasses determine the classes to instantiate and postpone the actual creation to the subclasses. It emphasizes the change of "single object". The main points of its implementation include:　　海外民众戏言：警察黑道拜关公，妈祖庇护打渔翁，黎民祭拜大道公。医神保生大帝吴夲与瘟君成了同门师兄，千年斗法。天庭如人间，小人哦？胡宗宪在旁皱眉。