View of Duobu bridge in China's Tibet

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Aerial photo taken on Oct. 28, 2019 shows the Duobu bridge in Nyingchi, southwest China's Tibet Autonomous Region. The Duobu bridge is located on the Lhasa-Nyingchi high-grade road. (Xinhua/Purbu Zhaxi)

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Aerial photo taken on Oct. 28, 2019 shows the Duobu bridge in Nyingchi, southwest China's Tibet Autonomous Region. The Duobu bridge is located on the Lhasa-Nyingchi high-grade road. (Xinhua/Li Xin)

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Aerial photo taken on Oct. 28, 2019 shows the Duobu bridge in Nyingchi, southwest China's Tibet Autonomous Region. The Duobu bridge is located on the Lhasa-Nyingchi high-grade road. (Xinhua/Purbu Zhaxi)

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Aerial photo taken on Oct. 28, 2019 shows the Duobu bridge in Nyingchi, southwest China's Tibet Autonomous Region. The Duobu bridge is located on the Lhasa-Nyingchi high-grade road. (Xinhua/Li Xin)

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Aerial photo taken on Oct. 28, 2019 shows the Duobu bridge in Nyingchi, southwest China's Tibet Autonomous Region. The Duobu bridge is located on the Lhasa-Nyingchi high-grade road. (Xinhua/Purbu Zhaxi)

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Aerial photo taken on Oct. 28, 2019 shows the Duobu bridge in Nyingchi, southwest China's Tibet Autonomous Region. The Duobu bridge is located on the Lhasa-Nyingchi high-grade road. (Xinhua/Li Xin)

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A car runs on the Duobu bridge in Nyingchi, southwest China's Tibet Autonomous Region, Oct. 28, 2019. The Duobu bridge is located on the Lhasa-Nyingchi high-grade road. (Xinhua/Purbu Zhaxi)