noun 下载 🔗分享 拨链器，变速器 The mechanism on a bicycle used to move the chain from one sprocket (gear) to another. Examples : "The cyclist adjusted the derailleur to shift gears while climbing the hill. " 骑车人在爬坡的时候调整了拨链器（变速器），以便换挡。 vehicle machine device part sport technical 与AI对话词汇游戏阅读练习
noun 下载 🔗分享 拨链器，变速器 The entire gearset on a bicycle with such a mechanism. Examples : "The bicycle mechanic adjusted the derailleur to make the gear changes smoother. " 自行车修理工调整了变速器，让换挡更顺畅。 vehicle machine part technology 与AI对话词汇游戏阅读练习
