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直螺纹 : 39 phrases in 10 subjects |
| Automobiles | 3 |
| Aviation | 9 |
| Computer numerical control | 1 |
| Drilling | 2 |
| General | 6 |
| Mechanic engineering | 2 |
| Mechanics | 3 |
| Oil / petroleum | 3 |
| Plastics | 1 |
| Technology | 9 |
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