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化学分类 : 29 phrases in 10 subjects |
| Agriculture | 4 |
| Chemistry | 1 |
| Engineering geology | 1 |
| General | 1 |
| Genetics | 2 |
| Life sciences | 1 |
| Oil / petroleum | 1 |
| Space | 1 |
| Technology | 14 |
| United Nations | 3 |
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