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信号区
avia.	signal area
racing	signalling area

信号区: 78 phrases in 20 subjects

Advertising	8
Air defense	7
Antennas and waveguides	1
Astronautics	1
Aviation	3
Communications	4
Computer numerical control	1
Ecology	1
Economy	1
Electric machinery	1
Electronics	1
General	4
Information technology	2
Metallurgy	1
Oil / petroleum	1
Rail transport	2
Space	8
Technology	23
Telecommunications	7
Wind Energy	1