Aerial view of farmland in Lhasa river valley of Tibet

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Farmers work in the farmland in Lhasa river valley in Lhasa, southwest China's Tibet Autonomous Region, Sept. 9, 2020. (Xinhua/Purbu Zhaxi)

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Aerial photo taken on Sept. 9, 2020 shows a view of farmland in Lhasa river valley in Lhasa, southwest China's Tibet Autonomous Region. (Xinhua/Purbu Zhaxi)

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Aerial photo taken on Sept. 9, 2020 shows a view of farmland in Lhasa river valley in Lhasa, southwest China's Tibet Autonomous Region. (Xinhua/Purbu Zhaxi)

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Aerial photo taken on Sept. 9, 2020 shows a view of farmland in Lhasa river valley in Lhasa, southwest China's Tibet Autonomous Region. (Xinhua/Purbu Zhaxi)