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backward wave
geophys.	回波
hydroel.st.	反射波
math.	后向波
met.	反向波
telecom.	返波

backward wave: 74 phrases in 14 subjects

Air defense	9
Architecture	1
Aviation	8
Business	1
Electric machinery	1
Electronics	17
General	2
Geophysics	4
Gymnastics	1
Information technology	1
Metallurgy	2
Radio	5
Space	6
Technology	16