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Aerial photo taken on Jan. 11, 2020 shows workers patrolling along a railway of the Laoling tunnel in Tonghua city, northeast China's Jilin Province. (Xinhua/Xu Chang)
Aerial photo taken on Jan. 11, 2020 shows workers patrolling along a railway of the Laoling tunnel in Tonghua city, northeast China's Jilin Province. (Xinhua/Xu Chang)