The two tremendous continental countries shared a frontier of 4,000 miles in a vast arc from the frozen tundras of Siberia to the stark deserts of Central Asia.

• 这两个辽阔的大陆国家的共同边界从西伯利亚冻土地带到中亚细亚荒漠划出一个大弧形，长达四千多英里。