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| треугольная пирамида | |||
| тетраэдр; четырёхгранник | |||
| 四面体: 81 phrases in 9 subjects |
| Electronics | 2 |
| General | 41 |
| Geology | 3 |
| Mathematics | 8 |
| Microelectronics | 1 |
| Mineralogy | 1 |
| Mining | 2 |
| Oil and gas | 1 |
| Technology | 22 |
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