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M=f (C, S, A, U, E, a)　　你可以看到，中情局特工Rick Martinez（Freddy Rodriguez）在人迹罕至的沙漠地区被一群反政府武装分子包围。为了表示自己「足够强悍」，他一口气吞下了一只蝎子……(two) shall not forge or alter the certification materials to defraud the medical security fund;觉得玉米无所不能无所不会无往不利，一点也不担心他会淹死。　　6个性格迥异的人同住一个屋檐下，因为一次集体抵抗二房东的事件 而相熟起来，他们逐渐建立信任、产生友情，每天生活在一起的他们，难过时会相互抚慰，但更多的是各自承受，每个人都为了想要的生活或是梦想而努力着。合租屋的6个人是天通苑的缩影，也是北漂一族的缩影，他们在这里相遇，在这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.-Guo Cheng (Sponsor of the Public Reading Association)