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Now, let's imagine why these "checkpoints" are called "chains" in iptables. As we know, The purpose of a firewall is to match "rules" for passing messages, Then execute the corresponding Action, So, when the message passes through these checkpoints, You must match the rules on this level, However, there may be more than one rule on this level, But there are many rules, When we put these rules in a chain, A "chain" has been formed. Therefore, we imagine each "checkpoint" as shown in the following figure. In this way, it is more appropriate to call them "chain". Each message passing through this "checkpoint" must match all the rules on this "chain". If there are qualified rules, the corresponding actions of the rules will be executed.Define the interface first:听到陈启如此说，吕馨也没再拒绝。故事从灾难发生后一个月左右开始。不同于国外求生的方式，国内封闭式公寓、生活小区的脱险成了主人公吉伦、迦诺、马克共同的难题。食物与饮水的消耗的导致了三人必须尽快冲出丧尸的围困。艰难的逃生使得迦诺难以持续，而对面楼宇独自逃生的马克离双方唯一求生的汽车近在咫尺。主人公吉伦必须 保证已经深陷危险的同伴们至少有一个团结的方式，可信任的建立在这样的世界中是否可以如同往日?整个世界的灾难变化，人类避难所如何建立，可能面对庞大数量的丧尸群，求生与生存的关系，变得更加模糊不清。饱受家庭和社会催婚压力的都市女白领28岁女主高鑫，从小父母离异缺乏安全感，和前男友刚结束了一段不靠谱的感情之后，开始对婚姻和爱情产生了怀疑，决定集中精力在工作上，就在奋力争取一个公司的外派工作机会时发现公司要求自己要有稳定的家庭生活，百感交集时，正好在好朋友的咖啡厅偶然遇到了与众不同的追求二次元梦想的零恋爱经验26岁男主陆嵘二，他正在研究一款恋爱数据游戏需要搜集女生的恋爱经验，于是二人在在互惠互利的“合作”过程中渐渐发现真的爱上了对方，也因为对方而变成了更好的人、看到了更美好的世界，最后两人决定以不一定结婚为目的谈一场最纯粹的恋爱。