自行车简史
gh the 1970s, the 10-speed derailleur25) bikes which were popular in the 1970s, and of course the mountain bike of right now. There are also many oddball designs that never quite made it, including the Ingo (you have to see it to believe it).
一辆现代意义上的自行车是指一种有前后两个轮子的人力交通工具。它由人踩动踏板提供动力，踏板通过链条与后
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