This was a landscape where antelope of all kinds abounded—along with Bos primigenius, a kind of oxen that has become extinct.
这是一片充满了各种羚羊的土地——还有原牛，一种已经灭绝的牛。
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Under these circumstances, archaeologist Andrew Smith believes, the small herds of Bos primigenius in the desert became smaller, more closely knit breeding units as the drought took hold.