 |
| |||
| clean air; pure air | |||
| air pur: 16 phrases in 5 subjects |
| Earth sciences | 2 |
| Environment | 6 |
| General | 1 |
| Health care | 6 |
| Natural resourses and wildlife conservation | 1 |
|
| |||
| clean air; pure air | |||
| air pur: 16 phrases in 5 subjects |
| Earth sciences | 2 |
| Environment | 6 |
| General | 1 |
| Health care | 6 |
| Natural resourses and wildlife conservation | 1 |