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自然 单位 : 11 phrases in 11 subjects |
| Agriculture | 1 |
| Business | 1 |
| Commerce | 1 |
| Drilling | 1 |
| Economy | 1 |
| Engineering geology | 1 |
| Geophysics | 1 |
| Information technology | 1 |
| Oil / petroleum | 1 |
| Technology | 1 |
| Telecommunications | 1 |
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