This aerial photo taken on April 7, 2023 shows the spring scenery at Yani national wetland park in Nyingchi, southwest China's Tibet Autonomous Region. (Xinhua/Tian Jinwen)

This aerial photo taken on April 7, 2023 shows the spring scenery at Yani national wetland park in Nyingchi, southwest China's Tibet Autonomous Region. (Xinhua/Tian Jinwen)

This photo taken on April 7, 2023 shows the spring scenery at Yani national wetland park in Nyingchi, southwest China's Tibet Autonomous Region. (Xinhua/Tian Jinwen)

This stitched photo taken on April 7, 2023 shows the spring scenery at Yani national wetland park in Nyingchi, southwest China's Tibet Autonomous Region. (Xinhua/Nie Yi)

This aerial photo taken on April 7, 2023 shows the spring scenery at Yani national wetland park in Nyingchi, southwest China's Tibet Autonomous Region. (Xinhua/Chen Shangcai)

This photo taken on April 7, 2023 shows the spring scenery at Yani national wetland park in Nyingchi, southwest China's Tibet Autonomous Region. (Xinhua/Nie Yi)

This aerial photo taken on April 7, 2023 shows the spring scenery at Yani national wetland park in Nyingchi, southwest China's Tibet Autonomous Region. (Xinhua/Nie Yi)