 |
| |||
| purification system | |||
| purification device | |||
| cleaner | |||
| système d'épuration: 15 phrases in 7 subjects |
| Coal | 2 |
| Earth sciences | 2 |
| Environment | 5 |
| General | 2 |
| Natural resourses and wildlife conservation | 2 |
| Natural sciences | 1 |
| Waste management | 1 |
|
| |||
| purification system | |||
| purification device | |||
| cleaner | |||
| système d'épuration: 15 phrases in 7 subjects |
| Coal | 2 |
| Earth sciences | 2 |
| Environment | 5 |
| General | 2 |
| Natural resourses and wildlife conservation | 2 |
| Natural sciences | 1 |
| Waste management | 1 |