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双 密封 : 78 phrases in 13 subjects |
| Automobiles | 7 |
| Aviation | 1 |
| Chemistry | 9 |
| Compressors | 1 |
| Earth sciences | 1 |
| Electric machinery | 2 |
| Electronics | 4 |
| Mechanics | 3 |
| Metallurgy | 3 |
| Mining | 1 |
| Oil / petroleum | 8 |
| Space | 2 |
| Technology | 36 |
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