短語詞組短語deep -thick overburden 深厚覆蓋層deep overburden layers 深厚場地deep overburden gravel layer 深覆蓋厚卵礫石層deep overburden foundation 深覆蓋層地基deep and thick overburden 深厚覆蓋層deep overburden area 深覆蓋區(qū)constructed on deep overburden 深覆蓋層 返回 deep overburden