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Aerial photo shows a rainbow at the Hukou Waterfall scenic spot of the Yellow River at the border area between north China's Shanxi Province and northwest China's Shaanxi Province on Dec. 11, 2018. (Xinhua/Liu Hongda)
Aerial photo shows a rainbow at the Hukou Waterfall scenic spot of the Yellow River at the border area between north China's Shanxi Province and northwest China's Shaanxi Province on Dec. 11, 2018. (Xinhua/Liu Hongda)