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helical spring
dril. 盘簧
met. 螺旋弹簧
railw. 螺旋弓单簧
tech. 螺旋弹簧
telecom. 螺簧
helical spring: 36 phrases in 6 subjects
Architecture1
Automobiles20
Oil / petroleum2
Rail transport3
Shipbuilding1
Technology9