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光孔 guāngkǒng
auto. plain hole
busin. smooth hole
tech. unthreaded hole
光孔: 185 phrases in 28 subjects
Agriculture2
Air defense2
Anatomy1
Architecture2
Automated equipment1
Aviation5
Cartography1
Construction3
Cosmetics and cosmetology1
Dermatology2
Earth sciences3
Electronics19
Explosives and Explosive Ordnance Disposal3
General9
Geology1
Geophysics1
Metallurgy14
Nursing1
Oil / petroleum9
Otorhinolaryngology1
Polygraphy1
Shipbuilding2
Space16
Sports1
Technology78
Telecommunications4
Thermal Energy1
Water resources1