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结构键 : 14 phrases in 9 subjects |
| Agriculture | 2 |
| Chemistry | 3 |
| Electronics | 1 |
| Explosives and Explosive Ordnance Disposal | 1 |
| General | 1 |
| Metallurgy | 1 |
| Nautical | 1 |
| Polymers | 1 |
| Technology | 3 |
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