an operation to clear silt. 清除淤泥

People watch as water gushes from the Xiaolangdi Reservoir on the Yellow River in Jiyuan, Henan province, China, during an operation to clear silt from the water.Getty
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Hot Shots Photos of the Day: Bodypainting Festival, Running of the Bulls, Tour de France
http://www.ibtimes.co.uk/hot-shots-photos-day-bodypainting-festival-running-bulls-tour-de-france-1455575
July 6, 2014  http://www.voanews.com/media/photogallery/july-6-2014-day-in-photos/1951862.html

People fish along the bank of the Yellow River as the Sammenxia Dam discharges flood waters downstream in Pinglu, Shanxi province, China, July 6, 2014.
July 7, 2014  http://www.voanews.com/media/photogallery/july-7-2014-day-in-photos/1952440.html

Silt - Wikipedia, the free encyclopedia
http://en.wikipedia.org/wiki/Silt
淤泥 - 維基百科，自由的百科全書
http://zh.wikipedia.org/wiki/%E6%B7%A4%E6%B3%A5
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