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An exhibitor shows a device to assist knee joint at the 20th China Hi-Tech Fair (CHTF) in Shenzhen, south China's Guangdong Province, Nov. 16, 2018. (Xinhua/Mao Siqian)
20th China Hi-Tech Fair held in Shenzhen, S China's Guangdong
Source: Xinhua| 2018-11-17 17:13:15|Editor: Li Xia
