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对称素 : 21 phrases in 8 subjects |
| Chemistry | 1 |
| Dermatology | 4 |
| Desert science | 1 |
| Explosives and Explosive Ordnance Disposal | 1 |
| General | 1 |
| Metallurgy | 4 |
| Oil / petroleum | 1 |
| Technology | 8 |
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