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左螺旋
tech. left-hand helicity; left-hand screw; left-hand spin; left screw
左螺旋
: 48 phrases in 16 subjects
Agriculture1
Automobiles2
Aviation2
Bridge construction1
Drilling2
General1
Genetics3
Information technology2
Mechanics1
Metallurgy2
Molecular genetics2
Oil / petroleum7
Shipbuilding1
Space1
Technology19
Telecommunications1

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