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| circular operation (о принципе действия) | |||
| кругового действия: 15 phrases in 9 subjects |
| Astronautics | 1 |
| Hydraulic engineering | 3 |
| Natural resourses and wildlife conservation | 1 |
| Nautical | 3 |
| Nuclear and fusion power | 1 |
| Oceanography & oceanology | 1 |
| Radio | 1 |
| Shipbuilding | 3 |
| Technology | 1 |