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The underwater photo taken on Oct. 4, 2019 shows corals at the Boundary Island Tourist Attraction in Lingshui County, south China's Hainan Province. (Xinhua/Yang Guanyu)
The underwater photo taken on Oct. 4, 2019 shows corals at the Boundary Island Tourist Attraction in Lingshui County, south China's Hainan Province. (Xinhua/Yang Guanyu)