目的在于为改善洛阳市浅层地下水质，解决水质硬化问题提供一个参考依据。
The aim is to provide a reference for solving the high hardness problem of the shallow groundwater.
科学家指出，树木可以滤去土壤和地下水中的污染物，从而改善了农场周围的水质。
Scientists say the trees can also improve water quality around farms by removing pollutants from soil and groundwater.
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