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| 螺旋 形的: 24 phrases in 9 subjects |
| Agriculture | 1 |
| Architecture | 1 |
| Chemistry | 1 |
| Dermatology | 1 |
| General | 6 |
| Hydroelectric power stations | 2 |
| Mechanic engineering | 1 |
| Plastics | 2 |
| Technology | 9 |
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