Photo taken on Dec. 17, 2017 shows a rainbow arching over the Hukou Waterfall on the Yellow River in Jixian County, northwest China's Shanxi Province. (Xinhua/Lyu Guiming)
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Photo taken on Dec. 17, 2017 shows a rainbow arching over the Hukou Waterfall on the Yellow River in Jixian County, northwest China's Shanxi Province. (Xinhua/Lyu Guiming)
