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控制材料 : 59 phrases in 12 subjects |
| Aviation | 17 |
| Business | 2 |
| Economy | 2 |
| Electronics | 7 |
| General | 1 |
| International trade | 1 |
| Management | 3 |
| Metallurgy | 1 |
| Oil / petroleum | 3 |
| Space | 5 |
| Technology | 16 |
| United Nations | 1 |
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