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金属元素: 41 phrases in 11 subjects |
Agriculture | 3 |
Architecture | 1 |
Chemistry | 5 |
Earth sciences | 1 |
General | 2 |
Metallurgy | 11 |
Plastic surgery | 1 |
Technology | 14 |
United Nations | 1 |
Watchmaking | 1 |
Water resources | 1 |