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四氨基 : 43 phrases in 10 subjects |
| Chemistry | 14 |
| Electronics | 1 |
| General | 7 |
| Pharmacology | 12 |
| Polymers | 1 |
| Reproductive biology | 1 |
| Space | 1 |
| Technology | 1 |
| Textile industry | 1 |
| Water resources | 4 |
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