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自然 技术 : 12 phrases in 9 subjects |
| Automobiles | 1 |
| China | 1 |
| Earth sciences | 2 |
| General | 1 |
| Geography | 1 |
| Multimedia | 1 |
| Project management | 1 |
| United Nations | 3 |
| Water resources | 1 |
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