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A staff member cleans the exterior of a bullet train for the upcoming Spring Festival travel rush at a maintaining base in Shenyang, northeast China's Liaoning Province, Jan. 8, 2020. (Xinhua/Yang Qing)
A staff member cleans the exterior of a bullet train for the upcoming Spring Festival travel rush at a maintaining base in Shenyang, northeast China's Liaoning Province, Jan. 8, 2020. (Xinhua/Yang Qing)