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纵向波 : 19 phrases in 9 subjects |
| Architecture | 1 |
| Aviation | 2 |
| Business | 1 |
| Electronics | 3 |
| Explosives and Explosive Ordnance Disposal | 3 |
| Geology | 1 |
| Oil / petroleum | 3 |
| Technology | 4 |
| Telecommunications | 1 |
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