Read MoreQR codes – bar codes that can be read by mobile phones – have been used in China during the pandemic.QR codes – bar codes that can be read by mobile phones – have been used in China during the pandemic.
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Read MoreQR codes – bar codes that can be read by mobile phones – have been used in China during the pandemic.QR codes – bar codes that can be read by mobile phones – have been used in China during the pandemic.