Korea use drones to show warning messages about Corona Virus, as social distancing and the importance to wear a mask.
China use talking drones to warn citizens about social distancing
https://edition.cnn.com/videos/health/2020/02/01/china-talking-drones-coronavirus-nr-vpx.cnn
China use talking drones to warn citizens about social distancing
https://edition.cnn.com/videos/health/2020/02/01/china-talking-drones-coronavirus-nr-vpx.cnn
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