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| surface string | |||
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表层 管 : 29 phrases in 10 subjects |
| Drilling | 7 |
| Earth sciences | 2 |
| Economy | 1 |
| Engineering geology | 2 |
| Metallurgy | 1 |
| Oil / petroleum | 3 |
| Otorhinolaryngology | 2 |
| Shipbuilding | 1 |
| Technology | 9 |
| Telecommunications | 1 |
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