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花生也忙安慰道：五弟，你别难过了。武涉来的很快，连项羽都微微有些惊讶，这是随叫随到的。面对如此厚颜无耻，颠倒黑白的言论，天启只是淡淡回答道。哦，打游戏的技术还行，打斗地主，我一个人能挑你三个。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.原来，这案子闹大了。