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多 径的 : 17 phrases in 10 subjects |
| Air defense | 3 |
| Aviation | 1 |
| Electric machinery | 1 |
| Electronics | 2 |
| Explosives and Explosive Ordnance Disposal | 1 |
| General | 2 |
| Plastics | 1 |
| Space | 1 |
| Sports | 1 |
| Technology | 4 |
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