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壳箱 : 31 phrases in 12 subjects |
| Agriculture | 2 |
| Automobiles | 6 |
| Aviation | 1 |
| Compressors | 1 |
| Computer numerical control | 1 |
| Electronics | 4 |
| General | 1 |
| International trade | 2 |
| Metallurgy | 1 |
| Shipbuilding | 2 |
| Technology | 9 |
| Wind Energy | 1 |
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