| |||
| conservative substance; persistent substance; recalcitrant substance; refractory substance | |||
|
sustancia persistente : 4 phrases, 3 sujets |
| Chimie | 1 |
| Environnement | 2 |
| Nations unies | 1 |
| |||
| conservative substance; persistent substance; recalcitrant substance; refractory substance | |||
|
sustancia persistente : 4 phrases, 3 sujets |
| Chimie | 1 |
| Environnement | 2 |
| Nations unies | 1 |