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inner ring
auto. 滚动轴承
chem. 内圈
met. 内环
railw. 内环弹簧
shoot. 内十环; 内 10 环
inner ring
: 29 phrases in 7 subjects
Automobiles11
Darts2
Hydroelectric power stations1
Oil / petroleum2
Rail transport2
Technology10
Textile industry1