2004年夏日,古生物学家休·亨佛里克森和她的同事们开始了恐龙化石的挖掘工作。这是一项复杂而细致的发掘工程,亨佛里克森回想起当初发现这个古生物化石的情景:那是在美国南达科他州旷野的一个大牧场的丘陵的悬崖侧壁上,她发现一种让她难以辨别的痕迹,她左观右测,反复查看,终不 In the summer of 2004 paleontologist Hugh Hufflenson and her colleagues started digging dinosaur fossils. This is a complex and detailed exhumation project. Henfredsson recalls the discovery of the paleontological fossil: on the cliff side of a hilly ranch in the wilderness of South Dakota in the United States, she found a She was hard-to-discern the traces of her right and left measurements, repeated view, and finally