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分类材料 : 25 phrases in 11 subjects |
| Automobiles | 1 |
| Aviation | 2 |
| Business | 8 |
| Commerce | 1 |
| Earth sciences | 1 |
| Economy | 2 |
| Finances | 3 |
| General | 1 |
| International trade | 2 |
| Space | 1 |
| Technology | 3 |
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