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始祖鸟的骨骼和羽毛化石的发现丰富了人们有关鸟类早期演化的知识,但鸟类起源于哪类动物仍旧是古生物学家一个难解之谜。
The discovery of the archeopteryx bones and feathered fossils enriches people's knowledge of the early evolution of birds, but what type of animals the birds originated from is still an obscure mystery for paleontologists.