ageing of clay

老粘土层,hard clay... ... ) old clay 老粘土 ) ageing of clay 粘土老化 ) ageing of clay 粘土的老化 ...

老粘土层,hard clay... ... ) ageing of clay 粘土老化 ) ageing of clay 粘土的老化 ) ″Old Clayey Soil″ 老粘性土 ...