A sinkhole is a natural depression caused by the removal of underground soil by water.
阿灰岩坑是一个天然洼地，由地下土壤除水造成的。
Under this condition, the removal rate of petroleum from the soil was over 65% and 70%.
在该条件下，土壤中石油的去除率达65%和70%以上。
Under this condition, the removal rate of petroleum from the soil was over 65% and 70%.
在该条件下，土壤中石油的去除率达65%和70%以上。
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