View of Butuo Lake in China's Tibet

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Aerial photo taken on Sept. 19, 2020 shows a view of the Butuo Lake in Dengqen County, Qamdo, southwest China's Tibet Autonomous Region. (Xinhua/Zhan Yan)

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Aerial photo taken on Sept. 19, 2020 shows a view of the Butuo Lake in Dengqen County, Qamdo, southwest China's Tibet Autonomous Region. (Xinhua/Zhan Yan)

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Aerial photo taken on Sept. 19, 2020 shows a view of the Butuo Lake in Dengqen County, Qamdo, southwest China's Tibet Autonomous Region. (Xinhua/Zhan Yan)

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Aerial photo taken on Sept. 19, 2020 shows a view of the Butuo Lake in Dengqen County, Qamdo, southwest China's Tibet Autonomous Region. (Xinhua/Zhan Yan)

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Aerial photo taken on Sept. 19, 2020 shows a view of the Butuo Lake in Dengqen County, Qamdo, southwest China's Tibet Autonomous Region. (Xinhua/Zhan Yan)