(美联社旧金山电)史前时期的猎人使用矛与火猎捕许多大型动物,迫使它们绝种。
About 13,000 years ago, large mammoths, huge antelope and very tall camels, populated North America.
大约在一万三千年前,北美地区栖息许多体型巨大的长毛象、大羚羊与长得很高的骆驼。
All disappeared within a thousand years or so after the first Americans migrated from Asia.
第一批亚洲人迁徙到美洲之后,这些大型动物大约在一千年之内全数消失。
They had moved across a dry land bridge between the two continents.
这些亚洲人越过连接这两块大陆的干陆桥来到美洲。