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存 储盒 : 15 phrases in 10 subjects |
| Agriculture | 1 |
| Air defense | 1 |
| Aviation | 2 |
| Electronics | 3 |
| General | 2 |
| Multimedia | 2 |
| Project management | 1 |
| Space | 1 |
| Telecommunications | 1 |
| United Nations | 1 |
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