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处理 完 : 25 phrases in 11 subjects |
| Agriculture | 1 |
| Automobiles | 1 |
| Aviation | 2 |
| Ecology | 1 |
| Electronics | 1 |
| Metallurgy | 3 |
| Project management | 1 |
| Space | 3 |
| Technology | 9 |
| Telecommunications | 1 |
| Water resources | 2 |
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