Summer scenery at Lalu Wetland National Nature Reserve in Lhasa, southwest China`s Tibet Autonomous Region, May 24, 2022. Lalu wetland, known as `the Lung of Lhasa` is the highest natural wetland in China. (Photo/China News Service)

Summer scenery at Lalu Wetland National Nature Reserve in Lhasa, southwest China`s Tibet Autonomous Region, May 24, 2022. Lalu wetland, known as `the Lung of Lhasa` is the highest natural wetland in China. (Photo/China News Service)

Summer scenery at Lalu Wetland National Nature Reserve in Lhasa, southwest China`s Tibet Autonomous Region, May 24, 2022. Lalu wetland, known as `the Lung of Lhasa` is the highest natural wetland in China. (Photo/China News Service)

Summer scenery at Lalu Wetland National Nature Reserve in Lhasa, southwest China`s Tibet Autonomous Region, May 24, 2022. Lalu wetland, known as `the Lung of Lhasa` is the highest natural wetland in China. (Photo/China News Service)

Summer scenery at Lalu Wetland National Nature Reserve in Lhasa, southwest China`s Tibet Autonomous Region, May 24, 2022. Lalu wetland, known as `the Lung of Lhasa` is the highest natural wetland in China. (Photo/China News Service)

Summer scenery at Lalu Wetland National Nature Reserve in Lhasa, southwest China`s Tibet Autonomous Region, May 24, 2022. Lalu wetland, known as `the Lung of Lhasa` is the highest natural wetland in China. (Photo/China News Service)

Summer scenery at Lalu Wetland National Nature Reserve in Lhasa, southwest China`s Tibet Autonomous Region, May 24, 2022. Lalu wetland, known as `the Lung of Lhasa` is the highest natural wetland in China. (Photo/China News Service)

Summer scenery at Lalu Wetland National Nature Reserve in Lhasa, southwest China`s Tibet Autonomous Region, May 24, 2022. Lalu wetland, known as `the Lung of Lhasa` is the highest natural wetland in China. (Photo/China News Service)