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硬 结 壳 : 20 phrases in 9 subjects |
| Automobiles | 1 |
| Aviation | 1 |
| Desert science | 4 |
| General | 2 |
| Metallurgy | 1 |
| Oil / petroleum | 1 |
| Space | 3 |
| Technology | 3 |
| Wind Energy | 4 |
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