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展开线 : 26 phrases in 12 subjects |
| Agriculture | 1 |
| Air defense | 1 |
| Automobiles | 1 |
| Aviation | 1 |
| Bridge construction | 1 |
| Electronics | 1 |
| Hydroelectric power stations | 1 |
| Shipbuilding | 1 |
| Space | 11 |
| Technology | 5 |
| Textile industry | 1 |
| United States | 1 |
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