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双螺线 : 34 phrases in 11 subjects |
| Agriculture | 1 |
| Aviation | 1 |
| Biology | 1 |
| Bridge construction | 1 |
| Compressors | 2 |
| Electric machinery | 2 |
| Electronics | 1 |
| General | 3 |
| Space | 3 |
| Technology | 16 |
| Textile industry | 3 |
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