 |
| air circulation: 44 phrases in 15 subjects |
| Agriculture | 3 |
| Chemistry | 1 |
| Coal | 1 |
| Construction | 4 |
| Electronics | 1 |
| Energy industry | 1 |
| General | 2 |
| Materials science | 3 |
| Mechanic engineering | 1 |
| Medical appliances | 2 |
| Metallurgy | 2 |
| Mining | 3 |
| Municipal planning | 7 |
| Refrigeration | 8 |
| Technology | 5 |