Aerial view of Qinghai Lake in NW China's Qinghai

Aerial photo taken on March 30, 2021 shows a view of Qinghai Lake in northwest China's Qinghai Province. The frozen lake has started to thaw as the temperature rises in spring. (Xinhua/Wu Gang)

Aerial photo taken on March 30, 2021 shows a view of Qinghai Lake in northwest China's Qinghai Province. The frozen lake has started to thaw as the temperature rises in spring. (Xinhua/Wu Gang)

Aerial photo taken on March 30, 2021 shows a view of Qinghai Lake in northwest China's Qinghai Province. The frozen lake has started to thaw as the temperature rises in spring. (Xinhua/Wu Gang)

Aerial photo taken on March 30, 2021 shows a view of Qinghai Lake in northwest China's Qinghai Province. The frozen lake has started to thaw as the temperature rises in spring. (Xinhua/Wu Gang)