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锥壳 : 41 phrases in 12 subjects |
| Agriculture | 1 |
| Automobiles | 3 |
| Aviation | 1 |
| Bridge construction | 1 |
| Construction | 1 |
| General | 2 |
| Metallurgy | 1 |
| Oil / petroleum | 1 |
| Rail transport | 1 |
| Scientific | 1 |
| Space | 3 |
| Technology | 25 |
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