three-speed gear

three-speed gear是什么意思？three-speed gear怎么读？老师板报英语词典为用户提供单词three-speed gear的释义、three-speed gear的音标和发音、three-speed gear的用法、例句、词组、词汇搭配、近反义词等内容，帮助大家掌握单词three-speed gear。

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