自行车简史
ng men of means (they cost an average worker six month’s pay), with the hey-day being the decade of the 1880s.
Because the rider sat so high above the center of gravity, if the front wheel was stopped by a stone or rut in the road, or the sudden emergence of a dog, the entire apparatus13) rotated forward on its front axle, and the rider, with his legs trapped under the handlebars, was drop
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