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| 天然气 | |||
| 天然煤气 | |||
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rock gas : 21 phrases in 6 subjects |
| Construction | 1 |
| Explosives and Explosive Ordnance Disposal | 3 |
| Geology | 2 |
| Oil / petroleum | 7 |
| Technology | 7 |
| United Nations | 1 |
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