| Expression | 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 |
|---|---|
| Meaning | A device for shifting gears on a bicycle by moving the chain between sprocket wheels of different sizes. |
| Reading | tuō guǐ qì， zhuàn chè qì tōng guò zài bù tóng dà xiǎo de kòu liàn chǐ lūn jiàn yí dòng liàn tiáo ér zhuǎn huàn zì xíng chē chǐ lūn（ huàn dàng） de zhuāng zhì |
Tags: hsk4-limited5-part4
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