The soil pollution by petroleum is a common problem in the world.
当今土壤的石油污染是一种较为普遍的现象。
Soil heavy metal pollution is a universal problem in the world.
世界各国土壤均出现不同程度的重金属污染问题。
One of the most serious problems is the serious pollution of air, water and soil.
其中最严重的问题是严重污染的空气，水和土壤。
One of the most serious problems is the serious pollution of air, water and soil.
其中最严重的问题是严重污染的空气，水和土壤。
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