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极 盖 : 19 phrases in 11 subjects |
| Air defense | 2 |
| Desert science | 2 |
| Earth sciences | 1 |
| Electronics | 2 |
| Finances | 1 |
| Metallurgy | 2 |
| Nautical | 1 |
| Oil processing plants | 1 |
| Space | 2 |
| Technology | 4 |
| United Nations | 1 |
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