 |
| mean flow: 27 phrases in 14 subjects |
| Astronautics | 5 |
| Aviation | 1 |
| Ecology | 1 |
| Energy industry | 1 |
| Hydraulic engineering | 2 |
| Hydrology | 1 |
| Information technology | 1 |
| Makarov | 1 |
| Mathematics | 1 |
| Medical | 3 |
| Nanotechnology | 1 |
| Natural resourses and wildlife conservation | 3 |
| Technology | 2 |
| Water resources | 4 |