... collapsing soil 崩陷土 collapsing soil 崩陷土 collapsible soils 崩陷性土 ...
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collapsing soil 崩坍土; 崩陷土..
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If we managed to dig a several hundred foot vertical shaft and the soil was feeling generous, not collapsing inward and waiting for us to build the wall, the challenge of casting this concrete would still be great.
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