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| research stage; study phase | |||
| 研究 阶段: 21 phrases in 11 subjects |
| Bridge construction | 1 |
| Business | 1 |
| Commerce | 3 |
| Economy | 1 |
| General | 4 |
| Hydroelectric power stations | 2 |
| Metallurgy | 1 |
| Project management | 1 |
| Space | 3 |
| Technology | 3 |
| United Nations | 1 |
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