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界 直 径 : 22 phrases in 8 subjects |
| Artificial intelligence | 1 |
| Aviation | 1 |
| Electronics | 1 |
| Environment | 1 |
| Explosives and Explosive Ordnance Disposal | 6 |
| Metallurgy | 5 |
| Space | 4 |
| Technology | 3 |
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