The sediment of water body is the main carrier of heavy metal elements, their contents reflect the environmental quality in the water system.
水体沉积物是重金属元素的重要载体，其含量高低能够反应水系环境质量状况。
Water is one of the most important environmental elements.
水是重要的环境要素之一。
During the production and use of coal, the metal elements in coal get into the air, the water and the soil, causing environmental pollution, which is what people concern with.
在煤的加工利用过程中，煤中金属元素进入大气、水体和土壤，以致污染环境，这是人们关心的事。
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