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| clean atmosphere | |||
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| 天然 大 气: 26 phrases in 8 subjects |
| Company name | 2 |
| Earth sciences | 2 |
| Economy | 2 |
| Explosives and Explosive Ordnance Disposal | 1 |
| Geology | 1 |
| Oil / petroleum | 12 |
| Oil processing plants | 2 |
| Technology | 4 |
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