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| пещера; грот (в скалах); каверна; каверновая пустота | |||
| пустота; пора | |||
| карстовая пустота; грот | |||
| карст; впадина | |||
| 岩洞: 27 phrases in 4 subjects |
| Electronics | 5 |
| General | 10 |
| Geology | 9 |
| Technology | 3 |
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