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change speed gear
dril. 变速齿轮
change-speed gear
mech.eng. 变速齿轮〔装置〕
met. 变速齿轮
tech. 齿轮速度变换; 换向齿轮; 换排挡
change speed gear: 24 phrases in 11 subjects
Air defense1
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Drilling4
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