on a bicycle

相關句子：

1. A device for shifting gears on a bicycle by moving the chain between sprocket wheels of different sizes.
   脫軌器，轉撤器通過在不同大小的扣鏈齒輪間移動鏈條而轉換腳踏車齒輪(換檔)的裝置
2. This hill is too steep to ride up on a bicycle.
   這山太陡了，騎腳踏車可上不去。