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| operational area; working space | |||
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工作地区 : 21 phrases in 11 subjects |
| Aviation | 1 |
| China | 1 |
| Economy | 1 |
| Electronics | 2 |
| General | 3 |
| Geophysics | 1 |
| International Monetary Fund | 2 |
| Space | 1 |
| Sports | 1 |
| Technology | 7 |
| Transport | 1 |
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