Aerial photo taken on Oct. 27, 2019 shows the Polonggou grand bridge in Bomi County, Nyingchi of southwest China`s Tibet Autonomous Region. Polonggou grand bridge is the largest double pylon cable-stayed bridge in Tibet Autonomous Region. (Xinhua/Sun Fei)

Photo taken on Oct. 27, 2019 shows the Polonggou grand bridge in Bomi County, Nyingchi of southwest China`s Tibet Autonomous Region. Polonggou grand bridge is the largest double pylon cable-stayed bridge in Tibet Autonomous Region. (Xinhua/Sun Fei)

Aerial photo taken on Oct. 27, 2019 shows the Polonggou grand bridge in Bomi County, Nyingchi of southwest China`s Tibet Autonomous Region. Polonggou grand bridge is the largest double pylon cable-stayed bridge in Tibet Autonomous Region. (Xinhua/Sun Fei)

A car runs on the Polonggou grand bridge in Bomi County, Nyingchi of southwest China`s Tibet Autonomous Region, Oct. 27, 2019. Polonggou grand bridge is the largest double pylon cable-stayed bridge in Tibet Autonomous Region. (Xinhua/Sun Fei)

Aerial photo taken on Oct. 27, 2019 shows the Polonggou grand bridge in Bomi County, Nyingchi of southwest China`s Tibet Autonomous Region. Polonggou grand bridge is the largest double pylon cable-stayed bridge in Tibet Autonomous Region. (Xinhua/Sun Fei)

Aerial photo taken on Oct. 27, 2019 shows the Polonggou grand bridge in Bomi County, Nyingchi of southwest China`s Tibet Autonomous Region. Polonggou grand bridge is the largest double pylon cable-stayed bridge in Tibet Autonomous Region. (Xinhua/Sun Fei)