若疏浚深度不足以疏浚掉大部分受污底泥，则疏浚对于抑制底泥影响上覆水体水质的效果不理想。
If the most polluted sediment was not dredged, the overlying water quality could not be improved because of the releasing pollutants from sediment.
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通过疏浚保持河道的深度。
The depth of the river is maintained by dredging.
《新英汉大辞典》
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