 |
| |||
| first pollution | |||
| primary contamination | |||
| primary pollution | |||
| первичное загрязнение: 4 phrases in 3 subjects |
| Mass media | 1 |
| Natural resourses and wildlife conservation | 2 |
| Technology | 1 |
|
| |||
| first pollution | |||
| primary contamination | |||
| primary pollution | |||
| первичное загрязнение: 4 phrases in 3 subjects |
| Mass media | 1 |
| Natural resourses and wildlife conservation | 2 |
| Technology | 1 |