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潜在危险 : 14 phrases in 10 subjects |
| Architecture | 1 |
| Aviation | 1 |
| Ecology | 4 |
| Engineering geology | 2 |
| Environment | 1 |
| Explosives and Explosive Ordnance Disposal | 1 |
| General | 1 |
| Genetics | 1 |
| Space | 1 |
| Technology | 1 |
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