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高频道 : 25 phrases in 9 subjects |
| Air defense | 1 |
| Aviation | 1 |
| Communications | 1 |
| Electronics | 4 |
| Hydroelectric power stations | 1 |
| Information technology | 1 |
| Plastics | 1 |
| Technology | 14 |
| United Nations | 1 |
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