Aerial photo taken on March 24, 2020 shows the scenery along the Yarlung Zangbo River after a snowfall in southwest China's Tibet Autonomous Region. (Xinhua/Jigme Dorje)

Aerial photo taken on March 24, 2020 shows the scenery along the Yarlung Zangbo River after a snowfall in southwest China's Tibet Autonomous Region. (Xinhua/Purbu Zhaxi)

Aerial photo taken on March 24, 2020 shows the scenery along the Yarlung Zangbo River after a snowfall in southwest China's Tibet Autonomous Region. (Xinhua/Zhan Yan)

Aerial photo taken on March 24, 2020 shows the scenery along the Yarlung Zangbo River after a snowfall in southwest China's Tibet Autonomous Region. (Xinhua/Jigme Dorje)

Aerial photo taken on March 24, 2020 shows the scenery along the Yarlung Zangbo River after a snowfall in southwest China's Tibet Autonomous Region. (Xinhua/Sun Fei)

Aerial photo taken on March 24, 2020 shows the scenery along the Yarlung Zangbo River after a snowfall in southwest China's Tibet Autonomous Region. (Xinhua/Zhan Yan)

Bar-headed geese fly over forest along the Yarlung Zangbo River after a snowfall in southwest China's Tibet Autonomous Region, March 24, 2020. (Xinhua/Purbu Zhaxi)

Aerial photo taken on March 24, 2020 shows the scenery along the Yarlung Zangbo River after a snowfall in southwest China's Tibet Autonomous Region. (Xinhua/Zhan Yan)

Aerial photo taken on March 24, 2020 shows the scenery along the Yarlung Zangbo River after a snowfall in southwest China's Tibet Autonomous Region. (Xinhua/Sun Fei)

Aerial photo taken on March 24, 2020 shows the scenery along the Yarlung Zangbo River after a snowfall in southwest China's Tibet Autonomous Region. (Xinhua/Sun Fei)