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| 埋头孔: 23 phrases in 13 subjects |
| Architecture | 1 |
| Automobiles | 2 |
| Aviation | 4 |
| Business | 1 |
| Compressors | 3 |
| Dentistry | 1 |
| Electronics | 2 |
| General | 2 |
| Mechanic engineering | 1 |
| Plastics | 1 |
| Shipbuilding | 1 |
| Technology | 3 |
| Tools | 1 |
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