He is a co-writer of the study and an archaeologist at New York's Hartwick College.

他是这项研究的合著者，也是纽约哈特维克学院的一名考古学家。

David Anthony, the Hartwick College archaeologist, said, " Horses expand the concept of distance – you begin to think about places previously out of reach as being reachable."

哈特维克学院的考古学家大卫·安东尼说：“马扩大了距离的概念——你开始觉得以前遥不可及的地方可以到达。”