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| 封闭空隙 | |||
| 封闭孔隙; 闭型孔隙; 闭口孔隙; 闭合孔隙 | |||
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| 封闭腔; 封闭空隙 | |||
| closed void: 3 phrases in 2 subjects |
| Engineering geology | 2 |
| Technology | 1 |
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