Scientists say the trees can also improve water quality around farms by removing pollutants from soil and groundwater. 科學家說樹木也可以通過出去土壤及地下水中的污染物質以改善農田附近的水質。
The strategy specifies the maximum concentration of a pollutant which is allowed to be emitted. 這個策略確定了一種允許排放的污染物質的最高濃度。
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