four stage change-over gearfour stages change over gears四级: level Four; Band Four; Fully ...变速齿轮: change gear多级变速齿轮: step by step variable gear二级变速齿轮: double gear无级变速齿轮箱: infinitive variable gear box下载手机词典可随时随地查词查翻译关注微信公众号：chachacidian，回复:四级变速齿轮，即可在微信中查询翻译
