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声 波源 : 30 phrases in 9 subjects |
| Air defense | 2 |
| Aviation | 1 |
| Electronics | 2 |
| Explosives and Explosive Ordnance Disposal | 2 |
| Geophysics | 16 |
| Oil / petroleum | 1 |
| Plastics | 2 |
| Space | 1 |
| Technology | 3 |
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