纯金属打造?没点力气还骑不动呢
轮毂一圈的齿轮件用什么材料?全用金属可不轻
创意很新颖 就是感觉整体有点笨重
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纯金属打造?没点力气还骑不动呢
轮毂一圈的齿轮件用什么材料?全用金属可不轻
创意很新颖 就是感觉整体有点笨重