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| 折射波 | |||
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refraction wave : 26 phrases in 8 subjects |
| Air defense | 1 |
| Aviation | 1 |
| Communications | 1 |
| Explosives and Explosive Ordnance Disposal | 1 |
| Hydroelectric power stations | 1 |
| Oil / petroleum | 1 |
| Space | 7 |
| Technology | 13 |
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