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开口 孔 : 39 phrases in 9 subjects |
| Automobiles | 4 |
| Aviation | 1 |
| Chemistry | 1 |
| Compressors | 2 |
| Explosives and Explosive Ordnance Disposal | 1 |
| Metallurgy | 17 |
| Oil / petroleum | 2 |
| Technology | 10 |
| Textile industry | 1 |
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