Photo taken on Dec. 12, 2015 shows the underwater scenery of Qilian Islands in Sansha City, south China's Hainan Province. (Photo: Xinhua/Zhao Yingquan)
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Photo taken on Dec. 12, 2015 shows the underwater scenery of Qilian Islands in Sansha City, south China's Hainan Province. (Photo: Xinhua/Zhao Yingquan)