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| negative air pressure | |||
| subatmospheric pressure | |||
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负气压 : 30 phrases in 11 subjects |
| Agriculture | 1 |
| Automobiles | 5 |
| Aviation | 6 |
| Drilling | 1 |
| Electronics | 2 |
| General | 2 |
| Hydroelectric power stations | 1 |
| Nursing | 1 |
| Oil / petroleum | 1 |
| Pest control | 1 |
| Technology | 9 |
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