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| 软质岩 | |||
| 软岩 | |||
| 软岩石 | |||
| 较软岩 | |||
| 软质岩 (石); 软岩 (石); 软石; 软弱地层 | |||
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soft rock : 12 phrases in 6 subjects |
| Agriculture | 1 |
| Bridge construction | 1 |
| Drilling | 1 |
| Explosives and Explosive Ordnance Disposal | 1 |
| Rail transport | 1 |
| Technology | 7 |
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