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Signal base station
Secret: The itinerary card is "tracked throughout the process", and it is still useful after the mobile phone is turned off and the card is drawn, why?
Itinerary card
Health code
Hong Kong
Signal base station
02-17
![Secret: The itinerary card is "tracked throughout the process", and it is still useful after the mobile phone is turned off and the card is drawn, why?[fig]](data:image/gif;base64,R0lGODlhAQABAIAAAP///wAAACwAAAAAAQABAAACAkQBADs=)