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back azimuth
avia.	反方位
el.	反向角
forestr.	反方位角; 后向角增或减180°
hydroel.st.	后方位角
life.sc.	反方位角增或减180°
space	后向角
tech.	后视角

back azimuth: 3 phrases in 3 subjects

Aviation	1
Explosives and Explosive Ordnance Disposal	1
Space	1