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磨底 : 20 phrases in 9 subjects |
| Automobiles | 2 |
| Desert science | 1 |
| Drilling | 4 |
| Earth sciences | 1 |
| Electronics | 1 |
| General | 1 |
| Metallurgy | 1 |
| Oil / petroleum | 1 |
| Technology | 8 |
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