Frankfurt, Sept. 13, 2020 (Xinhua) -- People watch a smart robot explaining COVID-19 prevention measures at a shopping mall in Frankfurt, Germany, Sept. 12, 2020.

People watch a smart robot explaining COVID-19 prevention measures at a shopping mall in Frankfurt, Germany, Sept. 12, 2020. 1 / 2
Children watch a smart robot explaining COVID-19 prevention measures at a shopping mall in Frankfurt, Germany, Sept. 12, 2020. 2 / 2
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