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空 连 接 : 20 phrases in 9 subjects |
| Automobiles | 1 |
| Aviation | 1 |
| Ecology | 1 |
| General | 2 |
| Metallurgy | 1 |
| Plastics | 2 |
| Rail transport | 1 |
| Space | 4 |
| Technology | 7 |
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