A mechanic checks passenger seats of a bullet train which is used for Spring Festival travel rush at a maintenance center in Tianjin, north China, Jan. 25, 2017. (Xinhua/Lian Yi)
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A mechanic checks passenger seats of a bullet train which is used for Spring Festival travel rush at a maintenance center in Tianjin, north China, Jan. 25, 2017. (Xinhua/Lian Yi)
