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A cook prepares pot-planted vegetable aboard the "Tangzhugudao" theme train which runs from Xining to Xigaze on the Qinghai-Tibet Railway, on Jan. 21, 2019. (Xinhua/Zhang Long)
A cook prepares pot-planted vegetable aboard the "Tangzhugudao" theme train which runs from Xining to Xigaze on the Qinghai-Tibet Railway, on Jan. 21, 2019. (Xinhua/Zhang Long)