A rainbow appears in the sky over the Basum Lake in the city of Nyingchi, southwest China's Tibet Autonomous Region, Aug. 29, 2022. (Xinhua/Jiang Fan)

　　A rainbow appears in the sky over the Basum Lake in the city of Nyingchi, southwest China's Tibet Autonomous Region, Aug. 29, 2022. (Xinhua/Jiang Fan)

　　A rainbow appears in the sky over the Basum Lake in the city of Nyingchi, southwest China's Tibet Autonomous Region, Aug. 29, 2022. (Xinhua/Jiang Fan)

　　A rainbow appears in the sky over the Basum Lake in the city of Nyingchi, southwest China's Tibet Autonomous Region, Aug. 29, 2022. (Xinhua/Jiang Fan)

　　A rainbow appears in the sky over the Basum Lake in the city of Nyingchi, southwest China's Tibet Autonomous Region, Aug. 29, 2022. (Xinhua/Jiang Fan)

　　A rainbow appears in the sky over the Basum Lake in the city of Nyingchi, southwest China's Tibet Autonomous Region, Aug. 29, 2022. (Xinhua/Jiang Fan)