multiple speed gearboxmultiple-speed gearbox多级: multistage; notching; multis ...变速: change speed; shifting; vari ...箱: chest; box; case; trunk三级变速箱: three-range winding; three-ratio gear; triple-change gear多级变速: multi-change speed; multi-speed change下载手机词典可随时随地查词查翻译