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| энергетический цикл | |||
| круговорот энергии | |||
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energy cycle : 11 phrases in 8 subjects |
| Astronautics | 1 |
| Ecology | 2 |
| Energy industry | 2 |
| Geography | 1 |
| Makarov | 1 |
| Solar power | 2 |
| Technology | 1 |
| United Nations | 1 |
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