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природный оксид (a class of minerals that consists of naturally occurring chemical compounds in which elements are combined with oxygen, a hydroxyl group (in hydroxides), or both O and OH  thefreedictionary.com Lena Nolte) | |||
| natural oxide: 8 phrases in 3 subjects |
| Nuclear and fusion power | 4 |
| Polymers | 2 |
| Technology | 2 |