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back wave
bridg.constr. 反向波
expl. 反射波
tech. 反波; 返〔回,反射,反向〕波
telecom. 回波; 间隔波; 空号波
back ward wave
oil 反射波
back wave: 4 phrases in 3 subjects
Air defense1
Explosives and Explosive Ordnance Disposal2
Technology1