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clean energies | |||
pollution-free energy | |||
pollution free energy | |||
clean power | |||
clean energy resource | |||
clean energy; clean energy source; energy without pollution | |||
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Clean Energy |
清洁 能源 : 9 phrases in 6 subjects |
Automobiles | 1 |
Ecology | 3 |
Environment | 2 |
Hydroelectric power stations | 1 |
Oil / petroleum | 1 |
Technology | 1 |