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钻头牙轮 : 157 phrases in 10 subjects |
| Company name | 2 |
| Drilling | 48 |
| Earth sciences | 3 |
| Engineering geology | 8 |
| Explosives and Explosive Ordnance Disposal | 2 |
| General | 1 |
| Mechanics | 9 |
| Metallurgy | 1 |
| Oil / petroleum | 39 |
| Technology | 44 |
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