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keel
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keel
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鸟纲(化石)
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keel
龙骨
地质学特别是古生物学领域,是古代脊椎动物的骨骼和牙齿化石的统称,特别是第三纪后期和第四纪的哺乳类(如象、犀牛、马、鹿、骆驼、羚羊等)的骨骼和牙齿化石。
Biology
keel
龙骨瓣;龙骨突
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