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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我也預測第一堂課應該會像過去學其他語言時一樣，從基本問候語開始——但完全不是這麼回事。
圖像來源，Getty Images