The drain pipe jointing material of cement mortar with addition of water glass can effectively overcome the influence of groundwater and improve the quality of the joints.
在水泥砂浆中掺入水玻璃作为排水管的接口材料，能有效克服地下水影响，提高了接口工程质量。
Scientists say the trees can also improve water quality around farms by removing pollutants from soil and 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.
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。
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