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idle gear
archit. 不作用齿轮
auto. 中间空转齿轮
dril. 中间齿轮
met. 空转中介齿轮
oil 空转轮
tech. 换向齿轮; 惰齿轮; 空转〔载〕轮; 张紧皮带轮
wind. 惰轮
idle gear: 9 phrases in 5 subjects
Automobiles2
Drilling1
Oil / petroleum2
Rail transport1
Technology3