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| alternative energy sources | |||
| alternative energy resources; energy alternative | |||
| alternative energy; substitute energy | |||
| alternative energy source | |||
| 替 代 能源: 14 phrases in 8 subjects |
| Earth sciences | 3 |
| Ecology | 1 |
| Electronics | 1 |
| Energy industry | 2 |
| Environment | 1 |
| Explosives and Explosive Ordnance Disposal | 2 |
| Oil / petroleum | 2 |
| Wind Energy | 2 |
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