铁路穿越原始森林。
从西宁到拉萨，铁路穿越了很多山川。
From Xining to Lhasa, the railway crosses many mountains and rivers.
由1860年有数千公里长的铁路穿越东部山脉和深远向西密西西比河。
By 1860 there were thousands of miles of railroads crossing the eastern mountain ranges and reaching westward to the Mississippi.
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