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空隙 孔隙 : 40 phrases in 12 subjects |
| Bridge construction | 2 |
| Construction | 1 |
| Desert science | 2 |
| Drilling | 1 |
| Earth sciences | 1 |
| Engineering geology | 4 |
| General | 1 |
| Mining | 1 |
| Oil / petroleum | 12 |
| Shipbuilding | 1 |
| Technology | 13 |
| Wind Energy | 1 |
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