- gear up
- 加速: quicken; speed up; accelerat ...
- 传动装置: transmission; gearbox; geari ...
- 变速传动装置: speed gear; speed transformation transmission; speed transforming transmission; variable speed drive device; variable speed drives; variable-speed drive
- 恒速传动装置: constant speed drive
- 减速传动装置: gear down; gearing-down; speed reduction gearing
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