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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.在“十年浩劫”那迷茫．惆怅的日子里，愤怒被深深地埋在人们心中，敬爱的周总理逝世一周年，北京人涌向天安门，用花圈和呐喊冲破黎明前的黑暗。这时，罪恶的魔爪伸向人民，富有正义感的公安局的侦察员周志明为了保护悼念总理的无辜群众而被捕入狱。昔日为人民和法律尊严与罪犯顽强斗争的人民警察，如今与他亲手抓获的罪犯同囚一室。崇高的信念，朴实的良知，使他忠贞不渝，他坚信自己无罪．在狱中。他与恶势力英勇斗争，以一颗火热的心，拯救罪犯的丑恶灵魂。浩劫过后，周志明重新穿上警服．在侦破一起盗窃案时．发现女友的姐姐、姐夫均涉嫌其中，面对亲情和正义，他会如何抉择……谢谢大家。八十年代中期，曾经威风凛凛的跳伞教练张越新早已没了当年的豪情壮志，在一所聋哑学校里当一名普通的体育老师，天天为一家人生活上的琐事犯愁，当过舞蹈演员的妻子林白对他颇多埋怨。就算面对生活的窘境，老张依然天天积攒着成捆的破麻袋片，希望能乘着自己亲手做的滑翔伞，再一次实现翱翔蓝天的梦想。老张的固执和痴迷招致妻子和周围人的不理解，只有邻居若兰姑娘默默地支持着他……秦文天和海兰是经济发展银行的同事，上下级关系，两家对门而住，关系融洽。秦文天一家三口过着殷实的幸福生活：秦文天年轻有为，仕途平顺；妻子谢婉婷是个温婉娴静的妇产科医生。对门而住的海兰一家，老公孟三力是出版社的编辑，有着小康之家的闲适温馨。然而，秦文天意外的“撞人”事件，把秦文天和海兰卷入了绯闻的漩涡……大殿之中的五国诸侯都不由自主地打个寒颤。Typical plot: The second daughter-in-law has served her for 10 years, but she still thinks the daughter-in-law has a bad background and a low educational background. Always said, at the beginning did not look at the daughter-in-law unmarried pregnant how would not let her into the house.