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| 三氧化 铁: 41 phrases in 13 subjects |
| Agriculture | 3 |
| Architecture | 1 |
| Automobiles | 1 |
| Chemistry | 7 |
| Desert science | 1 |
| Electronics | 3 |
| Engineering geology | 1 |
| Metallurgy | 7 |
| Oil / petroleum | 1 |
| Pharmacology | 7 |
| Plastics | 1 |
| Space | 2 |
| Technology | 6 |
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