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高度线
avia.	altitude line echo
space	altitude line

高度线: 191 phrases in 33 subjects

Agriculture	2
Air defense	7
Aviation	31
Bridge construction	3
Business	6
Cartography	1
Compressors	1
Construction	1
Earth sciences	4
Economy	1
Electric machinery	1
Electronics	13
Explosives and Explosive Ordnance Disposal	4
General	4
Hydroelectric power stations	3
Information technology	1
International trade	1
Measuring instruments	1
Metallurgy	7
Navigation	2
Oil / petroleum	2
Plastics	1
Polymers	2
Rail transport	6
Scuba diving	1
Shipbuilding	2
Skydiving	2
Space	18
Technology	56
Telecommunications	3
Textile industry	1
United Nations	1
Wind Energy	2