Aerial photo taken on July 24, 2021 shows the Ice Valley at the headstream region of the Yangtze River in China. Chinese scientists launched a new round of expedition recently in the headwater region of the Yangtze River to investigate the region's ecological conditions. (Xinhua/Zhang Long)

Aerial photo taken on July 25, 2021 shows the scenery of the Tongtian River, a main stream of the source of the Yangtze River in China's Qinghai Province. Chinese scientists launched a new round of expedition recently in the headwater region of the Yangtze River to investigate the region's ecological conditions. (Xinhua/Zhang Long)

Aerial photo taken on July 26, 2021 shows the glacier at the headstream region of the Yangtze River in China. Chinese scientists launched a new round of expedition recently in the headwater region of the Yangtze River to investigate the region's ecological conditions. (Xinhua/Zhang Long)

Aerial photo taken on July 27, 2021 shows the view of the Qumar River at the headstream region of the Yangtze River in China. Chinese scientists launched a new round of expedition recently in the headwater region of the Yangtze River to investigate the region's ecological conditions. (Xinhua/Zhang Long)

来源：Xinhua