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卡片系统 : 27 phrases in 10 subjects |
| Aviation | 3 |
| Business | 3 |
| Economy | 2 |
| Electronics | 7 |
| Finances | 1 |
| General | 1 |
| Information technology | 1 |
| Mathematics | 1 |
| Metallurgy | 3 |
| Technology | 5 |
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