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天然气 和石油 : 26 phrases in 9 subjects |
| Automobiles | 2 |
| Company name | 3 |
| Earth sciences | 7 |
| Economy | 1 |
| Finances | 1 |
| Geophysics | 1 |
| Oil / petroleum | 7 |
| Technology | 3 |
| Telecommunications | 1 |
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