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密封结 : 44 phrases in 13 subjects |
| Automobiles | 2 |
| Aviation | 3 |
| Ecology | 3 |
| Electronics | 3 |
| Lighting other than cinema | 1 |
| Metallurgy | 3 |
| Nuclear and fusion power | 1 |
| Oil / petroleum | 1 |
| Oil processing plants | 2 |
| Plastics | 2 |
| Refrigeration | 1 |
| Space | 4 |
| Technology | 18 |
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