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发布时间: 2022-6-6 21:40
正文摘要:死飞你一定见过或者听过，齿轮和车轮固定在一起，当你向前踩踏时，自行车就向前推进，当你向后踩踏时，车轮就向后推进，奥运赛场上场地自行车追逐赛，计时赛都是使用的这种自行车。他是一种单速自行车，但并不是真正 ... |
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