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递级 : 24 phrases in 12 subjects |
| Aviation | 1 |
| Business | 1 |
| Chemistry | 1 |
| Economy | 1 |
| General | 1 |
| Information technology | 1 |
| Oil / petroleum | 4 |
| Securities | 1 |
| Space | 1 |
| Sports | 1 |
| Technology | 10 |
| Telecommunications | 1 |
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