- relay box
- 中继: relay; repeating; relaying; ...
- 中继变压器: relay transformer
- 变速器: change gear box; derailleur; gear shift; speed change gear; speed changer; speed exchanger; speed transmission; speed variator; speed-variator; tra mi ion (gearbox); tra mitter; transmission gearbox; transmission gear box; transmitter; variable speed device; variator
- 变速器；变速: gearshift
- （副变速器）变速杆: range selector
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