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数 字 调节 : 15 phrases in 10 subjects |
| Automobiles | 1 |
| Aviation | 3 |
| Business | 1 |
| Economy | 1 |
| Electronics | 1 |
| International trade | 2 |
| Metallurgy | 2 |
| Refrigeration | 1 |
| Space | 2 |
| Technology | 1 |
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