| Back | 脱轨器，转撤器通过在不同大小的扣链齿轮间移动链条而转换自行车齿轮（换档）的装置 |
|---|---|
| Front | tuōguǐ qì zhuàn chè qì tōngguò zài bùtóng dàxiǎo de kòu liàn chǐlún jiān yídòng liàntiáo ér zhuǎnhuàn zìxíngchē chǐlún huàndàng de zhuāngzhì A device for shifting gears on a bicycle by moving the chain between sprocket wheels of different sizes. |
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