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| pressure gradient: 109 phrases in 19 subjects |
| Agriculture | 3 |
| Aviation | 2 |
| Chemistry | 2 |
| Computer numerical control | 3 |
| Desert science | 3 |
| Drilling | 7 |
| Earth sciences | 5 |
| Electronics | 3 |
| Engineering geology | 2 |
| Geophysics | 1 |
| Mining | 7 |
| Oil / petroleum | 14 |
| Rail transport | 4 |
| Refrigeration | 3 |
| Space | 6 |
| Sports | 1 |
| Surgery | 2 |
| Technology | 29 |
| Wind Energy | 12 |
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