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The primary pollutant of surface sediment is Organic matter.
表层沉积物主要污染因子为有机质；
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Sediment disaster is one of the major disasters on the earth surface.
泥沙灾害是地球表层的主要灾害之一。
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Sediment disaster is one of the major disasters on the earth surface.
泥沙灾害是地球表层的主要灾害之一。
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