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| backward wave | |||
| 后向波: 13 phrases in 8 subjects |
| Air defense | 5 |
| Aviation | 2 |
| Electronics | 1 |
| Explosives and Explosive Ordnance Disposal | 1 |
| Gymnastics | 1 |
| Nanotechnology | 1 |
| Remote sensing | 1 |
| Technology | 1 |
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