土壤有自净能力但是它的自净能力是有限的。长期的污水灌溉也会带来污染物积

土壤有自净能力但是它的自净能力是有限的。长期的污水灌溉也会带来污染物积累，尤其是重金属，从而危害人类健康。

結果 (英文) 1:

Self-purification ability of soil but the self-purification capacity is limited. Sewage irrigation can bring long-term accumulation of pollutants, especially heavy metals, thereby endangering human health.

結果 (英文) 2:

Self-purification ability of soil but its self-purification capacity is limited. It will bring long-term accumulation of pollutants in waste water for irrigation, especially heavy metals, thereby endanger human health.

結果 (英文) 3:

The soil self purification ability but its self purification ability is limited. Long term sewage irrigation can also lead to the accumulation of pollutants, especially heavy metals, which endanger human health.