 |
| English thesaurus | |||
| |||
| CA | |||
| cleaning air: 15 phrases in 6 subjects |
| Environment | 6 |
| Forestry | 1 |
| General | 1 |
| Natural resourses and wildlife conservation | 3 |
| Nuclear physics | 3 |
| Transport | 1 |
|
| English thesaurus | |||
| |||
| CA | |||
| cleaning air: 15 phrases in 6 subjects |
| Environment | 6 |
| Forestry | 1 |
| General | 1 |
| Natural resourses and wildlife conservation | 3 |
| Nuclear physics | 3 |
| Transport | 1 |