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键 穿孔 : 35 phrases in 14 subjects |
| Agriculture | 1 |
| Architecture | 1 |
| Aviation | 1 |
| Business | 3 |
| Data processing | 1 |
| Earth sciences | 1 |
| Economy | 1 |
| Electronics | 2 |
| Finances | 1 |
| General | 2 |
| Information technology | 1 |
| Oil / petroleum | 2 |
| Space | 2 |
| Technology | 16 |
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