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密封层 : 61 phrases in 11 subjects |
| Automobiles | 3 |
| Chemistry | 2 |
| Drilling | 1 |
| Ecology | 1 |
| Electronics | 4 |
| Metallurgy | 4 |
| Oil / petroleum | 3 |
| Plastics | 2 |
| Refrigeration | 2 |
| Space | 2 |
| Technology | 37 |
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