- the formation is unstable
- 地层: stratum; layer; serati; geos ...
- 不稳定: instability; unstabitily; sw ...
- 表面层不稳定性: interfacial instability
- 不稳定地层: caving ground; heavy ground; nonresistant strata; soft ground
- 地层不整合: discordance of stratification; stratigraphic unconformity; stratigraphical discordance; stratigraphicaldiscordance
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