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| 项目工程作业 | |||
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project work : 23 phrases in 8 subjects |
| Aviation | 4 |
| China | 1 |
| Economy | 2 |
| Finances | 1 |
| Hydroelectric power stations | 6 |
| Space | 1 |
| Technology | 6 |
| United Nations | 2 |
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