 |
| low frequency: 53 phrases in 15 subjects |
| Astronomy | 1 |
| Communications | 24 |
| Earth sciences | 1 |
| Electric motors | 1 |
| Electronics | 13 |
| Environment | 1 |
| General | 1 |
| Health care | 1 |
| Information technology | 1 |
| Mechanic engineering | 1 |
| Medical | 1 |
| Metallurgy | 3 |
| Natural sciences | 1 |
| Technology | 1 |
| Transport | 2 |