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| 洁净的燃油 | |||
| 清洁燃料 | |||
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| 清洁燃料 | |||
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clean fuel : 14 phrases in 7 subjects |
| Automobiles | 2 |
| Aviation | 1 |
| Business | 1 |
| Chemistry | 1 |
| Electronics | 5 |
| Oil / petroleum | 2 |
| Technology | 2 |
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