|
H : 275 phrases in 29 subjects |
| Antennas and waveguides | 13 |
| Aviation | 2 |
| Chemistry | 97 |
| Communications | 17 |
| Earth sciences | 22 |
| Ecology | 1 |
| Electronics | 30 |
| Environment | 4 |
| Food industry | 5 |
| Food service and catering | 2 |
| General | 13 |
| Health care | 9 |
| Industry | 3 |
| Information technology | 2 |
| Life sciences | 1 |
| Mechanic engineering | 3 |
| Medical | 17 |
| Metallurgy | 3 |
| Name of organization | 2 |
| Obsolete / dated | 1 |
| Packaging | 2 |
| Politics | 1 |
| Power lines | 2 |
| Social science | 1 |
| Soil science | 2 |
| Technology | 6 |
| Telecommunications | 1 |
| Transport | 12 |
| United Nations | 1 |