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| пещера; грот (в скалах); карст; каверна; каверновая пустота; каменный грот; пустота | |||
| карстовая пустота | |||
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石洞 : 27 phrases in 5 subjects |
| Electronics | 5 |
| General | 15 |
| Geology | 5 |
| Oil / petroleum | 1 |
| Water supply | 1 |
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