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| 天然可燃物 | |||
| 天然燃料 | |||
| natural fuel: 12 phrases in 8 subjects |
| Automobiles | 1 |
| Ecology | 1 |
| Electronics | 2 |
| Metallurgy | 2 |
| Oil processing plants | 3 |
| Shipbuilding | 1 |
| Space | 1 |
| Technology | 1 |
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