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Tree tree = new Tree ("A");A. Freestyle wrestling: 48-54KG, 58KG, 63KG, 69KG, 76KG, 85KG, 97KG, 97-130KG;33个不同的故事，展现33段不同的人生经历。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.一组年轻人重回到工作过的夏令营营地，意图掩盖五年前的一场意外。随着他们的到来，营地每天都有人意外死亡，究竟五年前发生了什么，谁又是凶手。It can be said that cancer is a chronic disease, and