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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.经验丰富的现役救护总队目麦在田（马德钟饰），拥有幸福完整的家庭，却因为司机醉驾，令老婆章可岚（李佳芯饰）失救致死，因此痛恨任意妄为的人和事。自小父母离异的卓家杰（何广沛饰）机缘巧合，成为麦在田下属。透过二人经历不同的救护案件，让观众感受到救护员一句安慰说话，或是无声陪伴，能减轻市民面对受伤的恐慌，与死亡的孤寂。该剧讲述了天地之间唯一神魔混血的少年穆天然同伏羲后人杨仁执、人类除魔师凌兮、魔族圣女罂粟等周旋于人间与魔界之间，斩妖除恶，惊心动魄的热血历险故事。自幼习武的快递员熊旦来自小山村，有着和大都市价值观格格不入的“侠肝义胆”。有次熊旦代替一个出车祸的同行送快递，意外救了昏迷在家的收件人，却被收件人的外孙女杨一一误认为是肇事者。两人矛盾渐深，成了一对见面就争吵的欢喜冤家。杨一一为了应付老妈的逼婚，哄骗老实巴交的熊旦谈起了“契约恋爱”。两人相互接触的过程中，熊旦所展现出来的原始、质朴的英雄气概和与众不同的浪漫，令杨一一越来越心动；熊旦也逐渐对这个外刚内柔的女孩子越发有了好感。经过一番波折，熊旦和杨一一这对波折不断的有情人终成眷属。流浪汉赵三发，与查案受伤的大内高手李传卫，因相貌相似偶然互换了身份。李传卫趁机混入反清组织并被委以重任，赵三发却入宫成了禅位前后的乾隆皇帝贴身侍卫。没有一丝武功的“低手”赵三发，游走于乾隆、嘉庆与和珅之间。虽然方法不同、地位不同、身份不同，但他们却明暗联手，在紧要关头，帮助嘉庆皇帝除掉了和珅，联手挫败了明教的叛乱阴谋。同时，他们也找回了相隔已久的兄弟亲情，找到了各自的所爱。随着朝野斗争逐渐明朗化，随着李传卫的记忆逐渐恢复，也随着赵三发的越搅越深，他们二人在无意中互相靠拢着。同时，他们渐渐感觉到了对方的存在。当嘉庆皇帝准备大赏功臣的时候，他们却离朝而去，一起去寻找自己亲生父母的坟茔。小女娃说她叫秋霜，是秋天生的，今年五周岁了，她是来拿柴火家去做饭的。星际之门是古老而先进的外星科技,利用扭曲时间和空间的虫洞(Wormhole)将物质于瞬间传送过宇宙。星际之门计划代号为52区,由乔治哈蒙少将指挥,直接向总统负责。基地位于科罗拉多州夏安山北美防空司令部下方,深达地下28层,是冷战时期为防核战而开凿所建。目前旗下共有25支SG小队。