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带螺纹 : 39 phrases in 9 subjects |
| Automobiles | 9 |
| Aviation | 2 |
| Drilling | 4 |
| Electronics | 1 |
| Ichthyology | 1 |
| Mechanics | 6 |
| Metallurgy | 1 |
| Oil / petroleum | 5 |
| Technology | 10 |
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