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丝绸之路穿过了一些相当崎岖的地形。在铺设道路之前,商队是如何穿过山区、沙漠等地的?他们一路上能有什么样的速度?
The Silk Road ran through some pretty rugged terrain. Before paved roads, how did caravans manage to push through the mountains, deserts, etc? What kind of speed could they manage along the way?
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