 |
| environmental level: 23 phrases in 10 subjects |
| Apollo-Soyuz | 1 |
| Ecology | 4 |
| Geophysics | 1 |
| Makarov | 3 |
| Medical | 4 |
| Natural resourses and wildlife conservation | 3 |
| Nuclear and fusion power | 1 |
| Production | 2 |
| United Nations | 3 |
| Weapons of mass destruction | 1 |
|
| environmental level: 23 phrases in 10 subjects |
| Apollo-Soyuz | 1 |
| Ecology | 4 |
| Geophysics | 1 |
| Makarov | 3 |
| Medical | 4 |
| Natural resourses and wildlife conservation | 3 |
| Nuclear and fusion power | 1 |
| Production | 2 |
| United Nations | 3 |
| Weapons of mass destruction | 1 |