1. 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自行車齒輪（換檔）的裝置
   A device for shifting gears on a bicycle by moving the chain between sprocket wheels of different sizes.
2. 那兩個齒輪一嚙合，機器就啟動了。
   The two cog-wheels engaged and the machine started.
3. 變速器，換檔裝置在一傳送過程中從一個齒輪變到另一個齒輪的一種機械裝置
   A mechanism for changing from one gear to another in a transmission.
4. 這齒輪位置不太正確。
   The gear is not quite true.
5. 一齒輪與另一齒輪嚙合。
   One cog-wheel engages with another.
6. 這機器的齒輪裝置很特別。
   The gearing of this machine is unusual.

齒的英語翻譯：

輪的英語翻譯：