I first came to North American in prehistoric times when I crossed the Bering Strait land bridge from Eurasia.

在史前时期，我从欧亚大陆穿越白令海峡、走过陆地、桥第一次来到了北美。

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The horse was re-introduced to America (as original paleo-American populations of wild horses from the Bering land bridge were extinct) and quickly adapted to free range on the sprawling great plains.

马重新有引入到美洲(最早由原始美洲人通过白令海峡带来的野马已经灭绝了)，迅速适应并遍布大平原。

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Scientists believe that these settlers crossed the Bering Strait in the Arctic to America by means of a land bridge which existed in prehistoric times.

科学家们认为这些定居者穿过白令海峡在北极到美国的一种方法中存在的陆地桥在史前时期。

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"Presumably, conditions were favourable on the Bering land bridge which was more of a large filter than an open highway, " suggested Professor Poinar.

BBC: Mammoths moved 'out of America'