同一时期，第一批拓荒者开始横越美国向西探险了；在1849年加州发现金矿之后，这种趋势极速加快。
During that same period, the first settlers began to move westward across the United States; this trend increased dramatically after the discovery of gold in California in 1849.
1935年底，美国的远程客机开始了横越太平洋的飞行。
Late in 1935 American clipper planes began trans - Pacific flight.
他跑步横越了美国，又一次成了名人。
He ran across the United States, once again became a celebrity.
他跑步横越了美国，又一次成了名人。
He ran across the United States, once again became a celebrity.
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