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螺旋 式转 : 21 phrases in 10 subjects |
| Agriculture | 1 |
| Automobiles | 1 |
| Biotechnology | 1 |
| Compressors | 1 |
| Dancing | 1 |
| General | 1 |
| Nautical | 1 |
| Oil / petroleum | 1 |
| Plastics | 3 |
| Technology | 10 |
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