It was very smoggy in Nanjing a student told me. And so she wore a mask.
Going through the entrance gate at the Nanjing Train Station to board her train back to Wuxi, she still wore her mask; having forgotten, as she told me, to remove it. A camera at the gate equipped with facial recognition software then wouldn't let her enter.
Once she took off her mask, the computer recognized her face as being okay and she was able to go on her way.
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