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区域元 : 15 phrases in 10 subjects |
| Aviation | 1 |
| Business | 1 |
| Computer networks | 2 |
| Economy | 1 |
| Electronics | 1 |
| Engineering geology | 1 |
| Metallurgy | 2 |
| Oil / petroleum | 1 |
| Technology | 4 |
| United Nations | 1 |
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