LINFEN, May 11, 2016 -- Tourists takes photo at the Hukou waterfall on the Yellow River on the Shanxi-Shaanxi border in north China, May 10, 2016. Due to the reduce of rainfall on the upper reaches and the decrease of water from the main stream of the Yellow River since later April, the Hukou Waterfall has become unusually clear. (Xinhua/Lyu Guiming)
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