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to phrases
开孔/口
avia.
aperture
开孔口
tech.
opening of hole
开 孔/口:
38 phrases
in 8 subjects
Automobiles
4
Chemistry
1
Compressors
2
Explosives and Explosive Ordnance Disposal
1
Metallurgy
17
Oil / petroleum
2
Technology
10
Textile industry
1
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