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潜 环 : 23 phrases in 11 subjects |
| Agriculture | 1 |
| Aviation | 2 |
| Desert science | 1 |
| Earth sciences | 4 |
| Ecology | 1 |
| Electronics | 1 |
| Explosives and Explosive Ordnance Disposal | 1 |
| Latin | 1 |
| Space | 1 |
| Technology | 8 |
| Water resources | 2 |
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