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油 淬火 : 51 phrases in 9 subjects |
| Automobiles | 1 |
| Computer numerical control | 1 |
| General | 1 |
| Mechanics | 4 |
| Metallurgy | 27 |
| Mining | 1 |
| Oil / petroleum | 2 |
| Space | 1 |
| Technology | 13 |
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