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主成本 : 52 phrases in 12 subjects |
| Aviation | 4 |
| Business | 9 |
| China | 2 |
| Economy | 9 |
| Electronics | 1 |
| Finances | 9 |
| General | 1 |
| International trade | 4 |
| Metallurgy | 3 |
| Project management | 3 |
| Space | 2 |
| Technology | 5 |
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