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| toe | |||
| bottom of hole; hole back; hole bottom | |||
| 钻孔底: 54 phrases in 9 subjects |
| Bridge construction | 3 |
| Chemistry | 1 |
| Earth sciences | 1 |
| Electronics | 1 |
| Engineering geology | 5 |
| Explosives and Explosive Ordnance Disposal | 1 |
| Hydroelectric power stations | 1 |
| Metallurgy | 1 |
| Technology | 40 |
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