英语词汇“step by-step variable gear”的翻译、意思、用法、释义-英汉双解词典-注文网

单词	step by-step variable gear
释义	step by-step variable gear [stɛp baɪ stɛp ˈvɛriəbəl ɡɪr] n. 多级变速装置
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