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extension field |
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 |