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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.项羽轻轻点头，沉吟许久，说道：加大对荥阳和成皋的攻势。Goo goo goo goo　　陈秀出身贫寒、父亲早逝，她跟母亲一样都是普通工厂职工，家里还有一名弟弟，从小患有聋哑症，智力稍微偏低，陈秀一直孜孜不倦的教导弟弟怎么学习自立。如果真有什么意外情况，出现断更，也必然会请假，不会无缘无故的失踪。2. Each receiver analyzes the request and then either processes it or passes it down.此时此刻，想要阻止已经是不可能了，朝堂上当着这么多人的面，有些事情是不能明说的。