调档: transfer the files; examine ...变速: change speed; shifting; vari ...变速调档: gear shifting倒档变速叉: reversing shifting fork两档变速器: two speed transmission四档变速: four speed gear shift; four-speed gear shift四档变速器: four speed gear shift; four speed transmission五档变速器: five speed transmission有档变速器: sttransmission超速档变速器: direct drive transmission; over drive tra mi ion; over drive transmision三级档变速器: three speed gearbox; three speed transmission手排档变速箱: manual transmission直接档变速器: direct drive tra mi ion; direct drive transmission变速器头档变速叉: transmission first shift fork插入式多档变速: semi-automatic mechanical transmission插入式多档变速器: interttype multi- eed tra mi ion; interttype multi-speed tranmission分段式多档变速器: interttype multi-speed tranmission; sectional type multi- eed tra mi ion; sectional type multi-speed tranmisssion手动换档变速器: manual shifted transmission; manual transmission; manually shifted tra mi ion; manually shifted transmission无声换档变速器: silent-mesh gearbox自动排档变速箱: automatic transmission调档: transfer the files; examine sb.'s record [dossier]动力助力换档变速器: power a isted shift tra mi ion; power assisted shift transmission; remote control trnasmission手控齿轮换档变速器: manual gear-shift transmission有级传动器, 有档变速器: step transmission调档叉: shift fork