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| 埋藏很深的石油 | |||
| 深成油 | |||
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deep oil : 15 phrases in 7 subjects |
| Drilling | 1 |
| Earth sciences | 2 |
| Mining | 1 |
| Navigation | 2 |
| Oil / petroleum | 1 |
| Oil processing plants | 2 |
| Technology | 6 |
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