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轴孔 zhóukǒng
el.mach.	shaft bore; shaft hole
tech.	axle hole; hollow of shaft; socket

轴孔: 168 phrases in 20 subjects

Agriculture	1
Architecture	1
Automobiles	32
Aviation	2
Compressors	5
Computer numerical control	2
Drilling	1
Electric machinery	16
Electronics	2
Engineering geology	1
Explosives and Explosive Ordnance Disposal	7
General	3
Latin	1
Metallurgy	17
Nautical	1
Oil / petroleum	4
Rail transport	3
Shipbuilding	12
Space	1
Technology	56