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块 矩阵 : 25 phrases in 9 subjects |
| Artificial intelligence | 1 |
| Automobiles | 1 |
| Aviation | 1 |
| Bridge construction | 2 |
| Chemistry | 1 |
| Electric machinery | 1 |
| Mathematics | 1 |
| Space | 3 |
| Technology | 14 |
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