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| 井眼扩大器; 扩眼器 | |||
| 扩孔器 | |||
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hole opener : 16 phrases in 6 subjects |
| Agriculture | 1 |
| Drilling | 4 |
| Earth sciences | 2 |
| Mechanics | 2 |
| Oil / petroleum | 5 |
| Technology | 2 |
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