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| природная стихия (Fire was described in ancient Greece as one of Earth’s ‘natural elements’ alongside water, air and earth. Гевар) | |||
| природный элемент | |||
| природный химический элемент | |||
| естественный элемент | |||
| natural element: 3 phrases in 3 subjects |
| Electronics | 1 |
| Mathematics | 1 |
| Nuclear physics | 1 |