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开 关 场 : 21 phrases in 10 subjects |
| Aviation | 1 |
| Chemistry | 1 |
| Electric machinery | 5 |
| Electronics | 3 |
| Geophysics | 1 |
| Hydroelectric power stations | 1 |
| Metallurgy | 2 |
| Space | 2 |
| Technology | 4 |
| United Nations | 1 |
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