- double speed gear
- 双: two; twin; both; dual
- 速: fast; rapid; quick; speedy
- 齿轮箱: gearbox; wheelbox gear casin ...
- 双速齿轮: two- eed gear; two-speed gear
- 变速齿轮箱: change gear case; change speed gear box; change-speed gear box; speed change gear box; speed-change gear box
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