 |
| |||
| air pollutant concentration (Alexander Demidov) | |||
| концентрация вредных веществ в атмосферном воздухе: 3 phrases in 2 subjects |
| General | 2 |
| Weapons of mass destruction | 1 |
|
| |||
| air pollutant concentration (Alexander Demidov) | |||
| концентрация вредных веществ в атмосферном воздухе: 3 phrases in 2 subjects |
| General | 2 |
| Weapons of mass destruction | 1 |