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成组结构 : 12 phrases in 9 subjects |
| Automobiles | 1 |
| Aviation | 1 |
| Business | 1 |
| Cryptography | 1 |
| Electronics | 1 |
| General | 1 |
| Metallurgy | 2 |
| Oil / petroleum | 1 |
| Technology | 3 |
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