Chinese scientists work during expedition in Sanjiangyuan area

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Cheng Shujie (L) makes meteorological measurement during an expedition to investigate the water resources and ecological environment in Sanjiangyuan area, northwest China's Qinghai Province, July 21, 2024. Chinese scientists embarked on an expedition on July 20 to investigate the water resources and ecological environment in the headwater regions of the Yangtze and Lancang rivers. The expedition will carry out scientific investigations into river hydrology, water ecology, soil erosion, glaciers and permafrost in Qinghai. (Xinhua/Wu Zhizun)