bicycle自行车; tire轮胎; stem竖管; tire pump打气筒; fender挡泥板; brake lever刹车握把; rim轮圈; brake cable闸线; headlight前灯; drive chain链条; front/rear derailleur前/后变速器; seat post 座杆; front/rear brake 前/后刹车; chain stay 后下叉; seat tube座管;hub轮毂
