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旅行的最原始的方法。我把这个名单上的原因是这是第一个方法人们用来移动。一旦人们开始走得地方。然后让人们思考他们如何能走得更快。
The most primitive method of travel. The reason I put this on the list is because this is the first method people used to move around. Once people started walking they got to places. That then got people thinking how they could go even faster.
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