условиям 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 |