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回声波
tech. echo wave
回声波: 57 phrases in 18 subjects
Acoustics1
Agriculture2
Air defense2
Aviation1
Earth sciences1
Electronics5
Engineering geology1
Explosives and Explosive Ordnance Disposal2
General2
Geophysics1
Information technology1
Nursing3
Plastics1
Reproductive biology2
Shipbuilding1
Space2
Technology26
United Nations3

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