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| 材料参考; 参考材料 | |||
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material reference : 31 phrases in 11 subjects |
| Agriculture | 1 |
| Aviation | 4 |
| Chemistry | 4 |
| Earth sciences | 3 |
| Electronics | 4 |
| Geophysics | 1 |
| Metallurgy | 1 |
| Space | 4 |
| Technology | 7 |
| United Nations | 1 |
| Water resources | 1 |
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