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Pic story: An expert's "rail" life (5)
(Xinhua) 08:41, November 10, 2021
Wang Qichang (C) instructs technicians at a sound barrier material factory in Chengdu, southwest China's Sichuan Province, Nov. 4, 2021.(Xinhua/Liu Kun)
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(Web editor: Zhong Wenxing, Liang Jun)
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