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| 不透水岩; 不透水岩石 | |||
| 不渗透层 | |||
| 防渗水岩石; 不透水岩 (石); 不渗透岩 (石) | |||
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impervious rock : 2 phrases in 2 subjects |
| Drilling | 1 |
| Engineering geology | 1 |
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