- 交换齿轮: change gear; interchangeable ...
- 组: group
- 交换齿轮: [机械工程] change gear; interchangeable gear◇交换齿轮箱 change gear box; change gear case
- 交换齿轮系: change gear train; interchangeable gear system
- 交换齿轮箱: change gear box
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