Brown-headed gulls fly over the Qinghai Lake in northwest China's Qinghai Province, July 10, 2020. (Xinhua/Zhang Hongxiang)

Aerial photo taken on July 10, 2020 shows a view of the Qinghai Lake in northwest China's Qinghai Province. (Xinhua/Zhang Hongxiang)

Aerial photo taken on July 10, 2020 shows a view of the Qinghai Lake in northwest China's Qinghai Province. (Xinhua/Zhang Hongxiang)

Aerial photo taken on July 10, 2020 shows a view of the Qinghai Lake in northwest China's Qinghai Province. (Xinhua/Zhang Hongxiang)

A brown-headed gull flies over the Qinghai Lake in northwest China's Qinghai Province, July 10, 2020. (Xinhua/Zhang Hongxiang)

Aerial photo taken on July 10, 2020 shows a view of the Qinghai Lake in northwest China's Qinghai Province. (Xinhua/Zhang Hongxiang)

Aerial photo taken on July 10, 2020 shows a view of the Qinghai Lake in northwest China's Qinghai Province. (Xinhua/Zhang Hongxiang)

Aerial photo taken on July 10, 2020 shows a view of the Qinghai Lake in northwest China's Qinghai Province. (Xinhua/Zhang Hongxiang)

Aerial photo taken on July 10, 2020 shows a view of the Qinghai Lake in northwest China's Qinghai Province. (Xinhua/Zhang Hongxiang)

Aerial photo taken on July 10, 2020 shows scenery around the Qinghai Lake in northwest China's Qinghai Province. (Xinhua/Zhang Hongxiang)