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ring type
tech. 环形
ring type: 105 phrases in 20 subjects
Agriculture6
Automobiles22
Chemistry2
Communications2
Compressors5
Computer networks2
Electric machinery3
Electronics8
Genetics1
Information technology2
Mechanics1
Metallurgy6
Oil / petroleum2
Plastics2
Polymers1
Rail transport2
Refrigeration2
Skydiving1
Space1
Technology34

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