- sliding double change speed wheel
- 滑动: slither; slippage; slipping; ...
- 双: two; twin; both; dual
- 变速: change speed; shifting; vari ...
- 变速轮: change pulley; change speed gear; change spur gear; change wheels; change-wheel; ratio gear; stud gear; variable speed wheel gear; variable-speed wheel gear
- 变速轮系: change gear train
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