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　　第一天上学，清优因跳错车而结识了同班同学佑和。没过多长时间，老师和同学就觉察出二人关系微妙。老师遂请家长到学校，清优大伯在学校见到佑和母亲后不禁大吃一惊，原来佑和的母亲竟然是自己十六年前在云南插队落户时的前女友，而佑和　　期间，有神秘女子（文咏珊饰）到监狱探望Laughing，这女子隶属比警队更高层次的保安局，Laughing入狱是再次担当卧底角色。当日，杀苏星柏是另有其人，保安局副局长（麦长青饰）怀疑整件事跟潜藏警队的黑警有关，所以借势要Laughing入狱调查。红蓝大作战奇异点明川，鹏海市法医中心主任，性格古怪，专业超群，在当地法医领域是个绝对权威。当明川站在尸检台前，他就成了鹏海市远近闻名的“听尸者”。适时，光明市又发生一起干尸案，凶手似乎受过专业训练，反侦察能力极强，被称为“杀人医生”。光明市女刑警队长罗笔芯认为“杀人医生”是警察系统内部人员的可能性很大，并将目光锁定在临市的明川身上…罗笔芯决定彻查明川和“杀人医生”案的关联，并开始调查明川神秘的经历和背景，随着调查的深入，一个深埋多年的秘密终于重见天日……1. The product life cycle includes introduction period, growth period, maturity period and recession period.二小姐哭得跟泪人一般。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.