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| 岩溶〔喀斯特〕溶洞; 石灰岩洞 | |||
| 溶洞 | |||
| 岩溶洞; 喀斯特溶洞 | |||
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| 石灰岩溶洞; 石钟乳洞 | |||
| karst cave: 8 phrases in 3 subjects |
| Engineering geology | 1 |
| Oil / petroleum | 1 |
| Technology | 6 |
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