|
toxic substance : 29 phrases in 14 subjects |
| Aviation | 1 |
| Ecology | 5 |
| Energy industry | 2 |
| Environment | 1 |
| Fish farming pisciculture | 1 |
| Makarov | 3 |
| Medical | 2 |
| Nanotechnology | 2 |
| Natural resourses and wildlife conservation | 1 |
| Oil and gas | 1 |
| Politics | 4 |
| Technology | 4 |
| Toxicology | 1 |
| Weapons of mass destruction | 1 |