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Creative modeThe role of members;In fact, iptables is not a real firewall. We can understand it as a client agent. Users execute the user's security settings into the corresponding "security framework" through iptables. This "security framework" is the real firewall. The name of this framework is netfilter.情与义值千金，刀山去地狱去又可憾。督察程天，经由兄弟修平与卧底俊轩帮助下屡破奇案，三人形成一个无敌铁三角，其后俊轩变节，三兄弟背道而驰，修平又在二人之间摇摆。三人身份对立，陷入正义与情义间的角力……那会是何人呢？尹将军已然顾不上理会。　　故事发展至第八季，重返临冬城的琼恩·雪诺（基特·哈灵顿 Kit Harington 饰）在布兰·史塔克（伊萨克·亨普斯特德-怀特 Isaac Hempstead-Wright 饰）口中得知了自己身世的秘密，让他与丹妮莉丝·塔格利安（艾米莉亚·克拉克 Emilia Clarke 饰）的关系蒙上了一层冰霜。It is an improvement on the common factory method mode. In the common factory method mode, if the passed string is wrong, the object cannot be created correctly, while multiple factory method modes provide multiple factory methods to create objects separately. Diagram: