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| cave in soil; earth cave; soil cavity | |||
| karstic earth cave; soil hole | |||
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土洞 : 34 phrases in 7 subjects |
| Bridge construction | 7 |
| Earth sciences | 1 |
| Ecology | 2 |
| Electronics | 1 |
| Engineering geology | 2 |
| Hydroelectric power stations | 3 |
| Technology | 18 |
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