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| 层 式 的: 21 phrases in 10 subjects |
| Architecture | 1 |
| Drilling | 1 |
| Explosives and Explosive Ordnance Disposal | 1 |
| General | 5 |
| Geophysics | 2 |
| Information technology | 1 |
| Mining | 4 |
| Plastics | 1 |
| Technology | 4 |
| Telecommunications | 1 |
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