该国南部是戈壁大沙漠，北部和西部都是高山。
The southern portion of the country is taken up by the Gobi Desert, while the northern and western portions are mountainous.
对于他们来说，最艰难的历程就是驾着马车跨越美国西部那个“美洲大沙漠”的那段。
The most difficult part of their trip was crossing the "Great American Desert" in the western part of the United States by horse and wagon.
对于他们来说，最艰难的历程就是驾着马车跨越美国西部那个“美洲大沙漠”的那段。
The most difficult part of their trip was crossing the "Great American Desert" in the western part of the United States by horse and wagon.
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