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油圈 yóuquān
oil oil ring
tech. scraper ring
油圈
: 138 phrases in 22 subjects
Agriculture2
Automobiles23
Aviation1
Chemistry8
Compressors9
Computer numerical control1
Construction2
Drilling2
Economy1
Electric machinery5
General2
Hydroelectric power stations1
Laboratory equipment1
Mechanic engineering3
Mechanics1
Metallurgy2
Nautical1
Oil / petroleum14
Racing and motorsport1
Rail transport1
Space1
Technology56

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