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| 研究领域; 研究范围 | |||
| 试验地区; 调查地区 | |||
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study area : 14 phrases in 7 subjects |
| Aviation | 1 |
| Business | 1 |
| Commerce | 1 |
| Earth sciences | 4 |
| Ecology | 1 |
| Economy | 1 |
| Technology | 5 |
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