| |||
| self-cleaning | |||
| self-purification | |||
|
auto-epuration : 21 phrases, 4 sujets |
| Environnement | 13 |
| Nations unies | 1 |
| Ressources naturelles et conservation de la faune | 4 |
| Sciences de la vie | 3 |
| |||
| self-cleaning | |||
| self-purification | |||
|
auto-epuration : 21 phrases, 4 sujets |
| Environnement | 13 |
| Nations unies | 1 |
| Ressources naturelles et conservation de la faune | 4 |
| Sciences de la vie | 3 |