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联步 : 20 phrases in 11 subjects |
| Air defense | 1 |
| Automobiles | 1 |
| Aviation | 1 |
| Electric machinery | 1 |
| Electronics | 3 |
| International trade | 1 |
| Name of organization | 3 |
| Polymers | 1 |
| Space | 1 |
| Technology | 4 |
| United Nations | 3 |
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