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| 压力下降; 压差 | |||
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drop in pressure : 17 phrases in 7 subjects |
| Bridge construction | 1 |
| Earth sciences | 2 |
| Explosives and Explosive Ordnance Disposal | 1 |
| Hydroelectric power stations | 1 |
| Metallurgy | 3 |
| Mining | 1 |
| Technology | 8 |
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