Aerial photo taken on April 30, 2020 shows the scenery of fields near Tangqung Co Lake in Nagqu, southwest China's Tibet Autonomous Region. (Xinhua/Tian Jinwen)

Photo taken on April 30, 2020 shows the scenery of Tangqung Co Lake in Nagqu, southwest China's Tibet Autonomous Region. (Xinhua/Hou Jie)

Two yaks are seen near Tangqung Co Lake in Nagqu, southwest China's Tibet Autonomous Region, April 30, 2020. (Xinhua/Hou Jie)

People dance by Tangqung Co Lake in Nagqu, southwest China's Tibet Autonomous Region, April 30, 2020. (Xinhua/Hou Jie)

A kid plays near Tangqung Co Lake in Nagqu, southwest China's Tibet Autonomous Region, April 30, 2020. (Xinhua/Tian Jinwen)

Aerial photo taken on April 30, 2020 shows the scenery of Tangqung Co Lake in Nagqu, southwest China's Tibet Autonomous Region. (Xinhua/Hou Jie)

Aerial photo taken on April 30, 2020 shows people riding horses by Tangqung Co Lake in Nagqu, southwest China's Tibet Autonomous Region. (Xinhua/Hou Jie)