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羟铁 : 35 phrases in 10 subjects |
| Agriculture | 3 |
| Chemistry | 2 |
| Earth sciences | 1 |
| General | 6 |
| Metallurgy | 4 |
| Oil / petroleum | 3 |
| Pharmacology | 4 |
| Sports | 1 |
| Technology | 9 |
| Water resources | 2 |
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