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| условия окружающей среды: 17 phrases in 12 subjects |
| Astronautics | 2 |
| Aviation | 3 |
| Biotechnology | 1 |
| Chemistry | 2 |
| Environment | 1 |
| Forestry | 1 |
| Information technology | 2 |
| Mechanic engineering | 1 |
| Natural resourses and wildlife conservation | 1 |
| Radio | 1 |
| Technology | 1 |
| United Nations | 1 |