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中空 zhōngkōng stresses
gen.	пустой; полый
avia.	средневысотный; средняя высота
oil.proc.	дуплистость

中空: 2396 phrases in 58 subjects

Aerodynamics	2
Aerohydrodynamics	1
American usage, not spelling	1
Astronautics	11
Automobiles	1
Aviation	294
Botany	1
Business	8
Cables and cable production	1
Cartography	4
Chemistry	2
Construction	2
Dialectal	1
Ecology	1
Education	1
Electronics	52
Engineering	1
Environment	2
Figure of speech	2
General	842
Geology	2
Helicopters	1
Historical	3
Household appliances	1
Idiomatic	1
Informal	2
Jargon	1
Jet engines	2
Law	5
Logistics	1
Mathematics	1
Medical	14
Metallurgy	3
Meteorology	1
Military	177
Mining	2
Modern use	1
Name of organization	5
Nanotechnology	1
Nautical	5
Nuclear and fusion power	1
Nuclear physics	1
Oil / petroleum	1
Oil and gas	1
Oil processing plants	6
Pest control	1
Photography	1
Polymers	1
Psychology	1
Rail transport	2
Scientific	1
Sports	1
Steel production	1
Technology	908
Textile industry	3
Transport	2
United Nations	2
United States	3