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perturbacion : 130 phrases in 28 subjects |
| Agriculture | 1 |
| Automatic control | 4 |
| Chemistry | 1 |
| Climatology | 2 |
| Communications | 14 |
| Computer numerical control | 5 |
| Earth sciences | 6 |
| Economics | 3 |
| Electricity generation | 1 |
| Electronics | 12 |
| Energy industry | 2 |
| Environment | 7 |
| Finances | 8 |
| Forestry | 1 |
| General | 4 |
| Health care | 5 |
| International Monetary Fund | 7 |
| Labor law | 1 |
| Law | 3 |
| Life sciences | 8 |
| Magnetics | 17 |
| Mathematics | 6 |
| Medical | 2 |
| Metallurgy | 2 |
| Natural sciences | 1 |
| Statistics | 5 |
| Transport | 1 |
| United Nations | 1 |