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。
2
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。
3
Scientists believe that these settlers crocced the Bering Strait in the Arctic to America by means of a land bridge which existed in prehistoric times.