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扩展域 : 17 phrases in 11 subjects |
| Air defense | 3 |
| Aviation | 1 |
| Computer networks | 1 |
| Cryptography | 2 |
| Electronics | 2 |
| Engineering geology | 1 |
| Information technology | 1 |
| Oil / petroleum | 1 |
| Technology | 3 |
| Textile industry | 1 |
| United Nations | 1 |
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