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(San Francisco,AP)Prehistoric human hunters,using spears and fire, drove many large animals to extinction.
（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。
