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联合层 : 25 phrases in 12 subjects |
| Aviation | 4 |
| Earth sciences | 4 |
| General | 1 |
| Metallurgy | 1 |
| Name of organization | 1 |
| Navigation | 1 |
| Plastics | 1 |
| Reproductive biology | 1 |
| Space | 5 |
| Technology | 2 |
| Textile industry | 1 |
| United Nations | 3 |
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