A gear (n.) is a crucial component in a transmission system. The verb form (v.) means to adapt or adjust.
齿轮（n.）是传动装置中的重要部件，而“适应”或“调整”（v.）则是其引申义。
| Front | gear |
|---|---|
| Back | n.齿轮，挡 v.使适应 |
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