 |
| |||
| volume de ventilation | |||
| air ventilation: 24 phrases in 11 subjects |
| Agriculture | 2 |
| Coal | 2 |
| Construction | 4 |
| Energy industry | 3 |
| General | 2 |
| Municipal planning | 1 |
| Natural resourses and wildlife conservation | 3 |
| Natural sciences | 4 |
| Technology | 1 |
| Transport | 1 |
| United Nations | 1 |