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。
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。
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。
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