African female train attendants undergo etiquette training under the guidance of manager Huang Xiaoli outside a train station in Kenya's capital Nairobi on May 16, 2017. (Photo/Xinhua)
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African female train attendants undergo etiquette training under the guidance of manager Huang Xiaoli outside a train station in Kenya's capital Nairobi on May 16, 2017. (Photo/Xinhua)
