到中国的丝绸贸易在世界上变得重要的时候,丝绸之路已经长达6500公里。
By the time the Chinese silk trade became important in the world, the Silk Road covered almost 6500 kilometers.
在军中服义务役的时候,努尔米带着一支步枪、一条子弹带和一个背包参加了20公里行军。
While serving a compulsory stint in the military, Nurmi entered a 20-k march carrying a rifle, a cartridge belt, and a knapsack.
如果没有窗户,我无法察觉什么时候停车,什么时候我们在以300公里每小时的速度前进。
If there were no windows, I wouldn't be able to tell when we were stopped or when we were traveling at 300 km/h.
But, you know, in 2D, the options are not just left and right or north and south, but infinity of possible directions in which I could go those 5 km.
但在二维空间中,不仅可以向左向右或者向南向北,我在走那5公里的时候可以有无数个方向
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