离开亚洲一年之后，我买了一辆价格不贵的自行车，借了些驼筐，就开始了由西自东穿越美洲大陆的自行车之旅。
One year away from Asia, I bought an inexpensive bicycle, borrowed some panniers, and rode across the American continent, west to east.
科学家们认为这些迁居者通过一条史前时期曾经存在的大陆桥穿越北极地区的白令海峡到达美洲。
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.
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