| |||
| conservative substance; persistent substance; recalcitrant substance; refractory substance | |||
|
sustancia persistente : 4 phrases in 3 subjects |
| Chemistry | 1 |
| Environment | 2 |
| United Nations | 1 |
| |||
| conservative substance; persistent substance; recalcitrant substance; refractory substance | |||
|
sustancia persistente : 4 phrases in 3 subjects |
| Chemistry | 1 |
| Environment | 2 |
| United Nations | 1 |