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周期 处理 : 10 phrases in 8 subjects |
| Automobiles | 1 |
| Aviation | 1 |
| Exhibitions | 1 |
| Explosives and Explosive Ordnance Disposal | 1 |
| Mathematics | 1 |
| Metallurgy | 2 |
| Space | 1 |
| Technology | 2 |
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