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Meet David Crosby in this portrait of a man with everything but an easy retirement on his mind.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.闲聊中，有人就神秘地说道：听说要大战了。　　监製Jazz透露：同盟「虽然有部份城寨演员参与，但故事是截然不同。今次会找来鲍起静（鲍姐）做『武则天』，在剧中管天下，而剧情讲到现代世界的角力，还有一些神秘情节，主要围绕陈展鹏、胡定欣、陈山聪、姚子羚之间的竞争。-Some problems with opening the mirror file after loading;2. There will only be one instance per startup in the application. Such as account system and database system.