Cellphone photo taken on May 15, 2021 shows the scenery in Gyironggou of Gyirong County, southwest China's Tibet Autonomous Region. Gyironggou is an important channel that goes through the Himalayas from the south to the north and also a major road for the exchanges among China, Nepal and the southern Asian continent. (Xinhua/Shen Hongbing)

Photo taken on May 15, 2021 shows the Gyirong Town in the mountains, in southwest China's Tibet Autonomous Region. Gyironggou is an important channel that goes through the Himalayas from the south to the north and also a major road for the exchanges among China, Nepal and the southern Asian continent. (Xinhua/Sun Ruibo)

Photo taken on May 15, 2021 shows the scenery in Gyironggou of Gyirong County, southwest China's Tibet Autonomous Region. Gyironggou is an important channel that goes through the Himalayas from the south to the north and also a major road for the exchanges among China, Nepal and the southern Asian continent. (Xinhua/Sun Ruibo)

Cellphone photo taken on May 15, 2021 shows azalea flowers and snow mountain in Gyironggou of Gyirong County, southwest China's Tibet Autonomous Region. Gyironggou is an important channel that goes through the Himalayas from the south to the north and also a major road for the exchanges among China, Nepal and the southern Asian continent. (Xinhua/Shen Hongbing)

Photo taken on May 15, 2021 shows the scenery in Gyironggou of Gyirong County, southwest China's Tibet Autonomous Region. Gyironggou is an important channel that goes through the Himalayas from the south to the north and also a major road for the exchanges among China, Nepal and the southern Asian continent. (Xinhua/Sun Ruibo)

Cellphone photo taken on May 15, 2021 shows the scenery in Gyironggou of Gyirong County, southwest China's Tibet Autonomous Region. Gyironggou is an important channel that goes through the Himalayas from the south to the north and also a major road for the exchanges among China, Nepal and the southern Asian continent. (Xinhua/Shen Hongbing)

Aerial photo taken on May 15, 2021 shows the scenery in Gyironggou o Gyirong County, southwest China's Tibet Autonomous Region. Gyironggou is an important channel that goes through the Himalayas from the south to the north and also a major road for the exchanges among China, Nepal and the southern Asian continent. (Xinhua/Sun Ruibo)

Cellphone photo taken on May 15, 2021 shows the scenery in Gyironggou of Gyirong County, southwest China's Tibet Autonomous Region. Gyironggou is an important channel that goes through the Himalayas from the south to the north and also a major road for the exchanges among China, Nepal and the southern Asian continent. (Xinhua/Shen Hongbing)

Photo taken on May 15, 2021 shows the scenery in Gyironggou of Gyirong County, southwest China's Tibet Autonomous Region. Gyironggou is an important channel that goes through the Himalayas from the south to the north and also a major road for the exchanges among China, Nepal and the southern Asian continent. (Xinhua/Sun Ruibo)

Cellphone photo taken on May 15, 2021 shows the scenery in Gyironggou of Gyirong County, southwest China's Tibet Autonomous Region. Gyironggou is an important channel that goes through the Himalayas from the south to the north and also a major road for the exchanges among China, Nepal and the southern Asian continent. (Xinhua/Shen Hongbing)

Cellphone photo taken on May 15, 2021 shows the scenery in Gyironggou of Gyirong County, southwest China's Tibet Autonomous Region. Gyironggou is an important channel that goes through the Himalayas from the south to the north and also a major road for the exchanges among China, Nepal and the southern Asian continent. (Xinhua/Shen Hongbing)