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电 声 的 : 41 phrases in 14 subjects |
Air defense | 1 |
Architecture | 2 |
Aviation | 1 |
Ecology | 1 |
Electric machinery | 1 |
Electronics | 3 |
General | 11 |
Geophysics | 5 |
Nautical | 1 |
Navigation | 1 |
Otorhinolaryngology | 1 |
Steel production | 1 |
Technology | 6 |
Telecommunications | 6 |