每日雅思词汇：自行车的结构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
