 |
| ventilations: 495 phrases in 40 subjects |
| Agriculture | 19 |
| Automobiles | 14 |
| British usage, not spelling | 2 |
| Chemistry | 4 |
| Coal | 45 |
| Communications | 1 |
| Computers | 5 |
| Construction | 70 |
| Customs | 1 |
| Earth sciences | 3 |
| Electric traction | 3 |
| Electronics | 8 |
| Emergency medical care | 12 |
| Energy industry | 1 |
| Engineering | 2 |
| Engines | 1 |
| Environment | 2 |
| General | 45 |
| Hobbies and pastimes | 2 |
| Industry | 1 |
| Labor law | 2 |
| Life sciences | 2 |
| Materials science | 1 |
| Measuring instruments | 8 |
| Mechanic engineering | 9 |
| Medical | 36 |
| Medical appliances | 5 |
| Metallurgy | 11 |
| Microsoft | 1 |
| Mineral products | 1 |
| Mining | 74 |
| Municipal planning | 33 |
| Natural resourses and wildlife conservation | 12 |
| Natural sciences | 1 |
| Non-governmental organizations | 1 |
| Nuclear physics | 5 |
| Refrigeration | 3 |
| Technology | 26 |
| Thermal engineering | 1 |
| Transport | 22 |