自行车简史

in mind, let’s look at the history of early bicycles that led up to the modern bicycle.
　　The Walking Machine
　　In 1817 Baron von Drais invented a walking machine that would help him get around the royal gardens faster: two same-size in-line wheels, the front one steerable, mounted in a frame which you straddled4). The device was propelled by pushing your feet against the ground, thus r
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