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螺旋筒 : 38 phrases in 12 subjects |
| Agriculture | 3 |
| Automobiles | 3 |
| Aviation | 1 |
| Chemistry | 1 |
| Drilling | 1 |
| Metallurgy | 1 |
| Oil / petroleum | 2 |
| Plastics | 2 |
| Port facilities | 1 |
| Shipbuilding | 2 |
| Technology | 20 |
| Telecommunications | 1 |
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