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Aerial photo taken on April 2, 2019 shows the half-frozen lake and wetland in the Altun Mountains National Nature Reserve in northwest China's Xinjiang Uygur Autonomous Region. (Xinhua/Hu Huhu)

Aerial photo taken on April 2, 2019 shows the half-frozen lake and wetland in the Altun Mountains National Nature Reserve in northwest China's Xinjiang Uygur Autonomous Region. (Xinhua/Hu Huhu)