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填料密封 : 42 phrases in 9 subjects |
| Automobiles | 7 |
| Chemistry | 3 |
| Compressors | 4 |
| Drilling | 2 |
| Electric machinery | 1 |
| Electronics | 1 |
| Metallurgy | 1 |
| Oil / petroleum | 8 |
| Technology | 15 |
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