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可惜，那两人毫无所觉，依旧那么大大方方地牵着，倒像他俩才是相依为命的兄妹似的。说着话，小葱也牵着香荽，兄妹几个叽叽喳喳地出去了。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.三重暧昧Your comments will promote the birth of the next article. Come and join us, guest officer, Mua Da ~ ~ ~.玉米觉得他又回到了张宅，跟爹娘睡在一张床上。The green arrow at the bottom indicates that it can be passed. Some ticket gates are two-way. When someone comes towards him, the green arrow will turn into a red fork.