A skeleton of the alvarezsauroid Alnashetri cerropoliciensis—representing a highly complete alvarezsauroid skeleton from South America—provides evidence on the evolution of the peculiar anatomy and miniaturization within this unusual theropod dinosaur clade.
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。业内人士推荐同城约会作为进阶阅读
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公式: f(x)=tanh(x)=ex−e−xex+e−x