A staff member demonstrates an optical motion capture system at the 24th China Hi-Tech Fair (CHTF) in Shenzhen, south China's Guangdong Province, Nov. 15, 2022. The 24th China Hi-Tech Fair (CHTF) kicked off on Tuesday in Shenzhen, south China's Guangdong Province, attracting over 5,600 exhibitors from 41 countries and regions. [Photo by Mao Siqian/Xinhua]
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