понижение уровня: 43 phrases in 13 subjects |
Aviation | 1 |
Construction | 2 |
Forestry | 2 |
General | 1 |
Geology | 8 |
Hydraulic engineering | 8 |
Meteorology | 2 |
Mining | 8 |
Natural resourses and wildlife conservation | 4 |
Oil and gas | 1 |
Politics | 1 |
Technology | 4 |
United Nations | 1 |