自行车简史
olling yourself and the device forward in a sort of gliding walk. The machine became known as hobby horse. It was made entirely of wood. This enjoyed a short-lived popularity as a fad5), not being practical for transportation in any other place than a well maintained pathway such as in a park or garden.
The Velocipede6) or Boneshaker7)
The next appearance of a two-wheeled riding machin
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