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见他们兄妹相依流泪。夜幕降临，小镇寂静祥和。不知从哪个角落，传来了倒计时的声音。少女璐娜跪坐在黑漆漆的房间内，头上戴着一个宇航员头盔，眼睛紧盯着电视屏幕中火箭发射直播。她对航空航天格外着迷，身为修鞋匠的父亲投其所好，连女儿的生日都专门特制了一双航天靴。父女俩志趣相投，共同朝着航天梦而努力。璐娜一天天长大，她的航天梦从未消失。她努力学习，刻苦训练，小有成就，却也遭受了更多的挫折。周青激战妖族大圣，得妖皇遗宝，勇斗西方极乐世界的佛陀……各种仙人、妖魔、佛陀接连出场，各种绚丽震撼的斗法争锋，让杨舟不禁深深沉迷其中。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.Static Factory Method ModeFrom these two names, there were later names such as Steve, Stephanie (female name) and St é phane (French).The second classification principle of organisms is the lineage classification principle aiming at establishing evolutionary lineage. The classification method following this principle is called lineage classification. The representative of pedigree classification is "branch systematics". It advocates that the branches in evolution should be taken as the criteria for identifying and distinguishing classification units and the basis for determining the pedigree relationship of each classification unit. The so-called co-ancestral proximity (similar to a group of people being a grandfather) is used to measure the genetic relationship between different taxa and determine their position in the pedigree. The classification system finally established is an evolutionary pedigree reflecting the history of phylogeny, which is a deeper description of biological relationship. In other words, the basic principle of pedigree classification is that the classification system conforms to the evolutionary pedigree. Pedigree classification is only applicable to organisms and cannot be used for abiotic classification.