1 . 表土
overall output 總產量overburden表土;復蓋巖層;蓋巖層overburdenpressure 積土壓力
2 . 覆蓋層
outwash plain 冰水沉積平原overburden覆蓋層overcast 天陰
3 . 復蓋巖層
overall output 總產量overburden表土;復蓋巖層;蓋巖層overburdenpressure 積土壓力
4 . 蓋巖層
overall output 總產量overburden表土;復蓋巖層;蓋巖層overburdenpressure 積土壓力