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化学 组合 : 14 phrases in 12 subjects |
| Animal husbandry | 1 |
| Biotechnology | 1 |
| China | 1 |
| Desert science | 2 |
| Earth sciences | 2 |
| General | 1 |
| International Monetary Fund | 1 |
| Oil / petroleum | 1 |
| Space | 1 |
| Technology | 1 |
| Telecommunications | 1 |
| Water resources | 1 |
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