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螺旋 齿 : 90 phrases in 19 subjects |
| Agriculture | 4 |
| Automobiles | 7 |
| Aviation | 2 |
| Compressors | 2 |
| Dermatology | 2 |
| Electronics | 1 |
| Engineering geology | 1 |
| General | 3 |
| Hydroelectric power stations | 7 |
| Mechanic engineering | 2 |
| Mechanics | 1 |
| Metallurgy | 3 |
| Oil / petroleum | 2 |
| Plastics | 1 |
| Shipbuilding | 2 |
| Space | 2 |
| Technology | 41 |
| Textile industry | 1 |
| Wind Energy | 6 |
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