Aerial photo taken on Jan. 28, 2021 shows a section of the Lhasa-Nagqu high-grade highway in southwest China's Tibet Autonomous Region.Photo:Xinhua

Aerial photo taken on Jan. 28, 2021 shows a section of the Lhasa-Nagqu high-grade highway in southwest China's Tibet Autonomous Region.Photo:Xinhua

Aerial photo taken on Jan. 28, 2021 shows a section of the No.109 national highway, the Qinghai-Tibet railway, a high-grade highway and a village-level road (L to R) between Lhasa and Nagqu in southwest China's Tibet Autonomous Region.Photo:Xinhua

Aerial photo taken on Jan. 28, 2021 shows a section of the No.109 national highway, the Qinghai-Tibet railway, a high-grade highway and a village-level road (L to R) between Lhasa and Nagqu in southwest China's Tibet Autonomous Region.Photo:Xinhua

Aerial photo taken on Jan. 28, 2021 shows a section of the Lhasa-Nagqu high-grade highway (R) and the Qinghai-Tibet railway in southwest China's Tibet Autonomous Region.Photo:Xinhua