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化合氮 : 56 phrases in 10 subjects |
| Biochemistry | 1 |
| Chemistry | 1 |
| Ecology | 2 |
| Electronics | 1 |
| Environment | 1 |
| General | 8 |
| Geochemistry | 2 |
| Medical | 6 |
| Oil processing plants | 7 |
| Technology | 27 |
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