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中 真空 : 25 phrases in 12 subjects |
| Automobiles | 2 |
| Aviation | 1 |
| Business | 1 |
| Ecology | 1 |
| Economy | 1 |
| Electronics | 3 |
| General | 6 |
| Metallurgy | 4 |
| Physics | 1 |
| Refrigeration | 1 |
| Technology | 3 |
| United States | 1 |
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