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Similar to the development of children from appearance and color to older children, they can be classified according to concepts. For example, if they know the concept of "food", no matter what kind of vegetables they look like, they should be classified into one category. The classification of biology has also developed in this way. The earliest method is to identify and distinguish species according to phenotypic characteristics, and to classify them step by step according to the degree of phenotypic similarity, so as to establish a classification system that is easy to retrieve. This is the principle of phenotypic classification. However, the problem of phenotypic classification is that it is difficult to reveal the essential laws of things. Many creatures with very different shapes may have kinship relationships. For example, the online sentence "When I knew sunflowers belonged to Compositae, I collapsed" is what it means.该剧主要讲述从身任警方卧底成功捣毁黑帮后重返警局的警员高家声（林峯饰）、PTU女沙展何慧玲（蔡卓妍饰）和铁面无私的队长刘建晖（方中信饰）为主人公进行展开的故事。三人在PTU虽然有误会、矛盾与冲突，但在执行任务、面对瞬间生死后，逐渐建立起真正的同僚友谊，成为了真正的好警察。肃王道：皇叔说错了。本片以近年来发生的十二起影响特别重大、案情复杂、侦破难度极大并成功侦破的刑事案件为背景，以纪实的风格、艺术地再现扑朔迷离，惊心动魄的侦查缉捕过程。《觅迹追踪》为“新警事”系列的第三部作品，该片集成了前两部快节奏、高密度的情节安排等特点，完全将美剧风格发挥的淋漓尽致，使其形成一涉案系列剧品牌。阀门厂老板周成龙失踪一天后，被人发现死在上村路一幢住宅内。死者的弟弟在案发后不知所踪，嫌疑重大。副队长诸葛智在案情调查中发现，死者刚离异的妻子周丽芳竟是自己的初恋女友，没想到婚后大款丈夫并没有给她带来几天的幸福。诸葛智认为此案情杀、仇杀的可能性极大，而队长陈海涛认为死者弟弟背后的那帮赌徒不仅有作案动机，也具备作案条件。对此，两种意见各执一词。红鼻子等赌徒被从广东捉拿回本市后，破案心切的王大鹏因刑讯逼供而被检察机关立案查处。经过两个多月的艰苦侦查，扑朔迷离的案情终于大白于天下，杀人凶手以及幕后主谋被缉拿归案……胡宗宪走后，赵光头凑上前来，神色略显警惕：船主，莫让当官的搅浑了咱们的水。