Shanghai mobile phone usually calls once every few days.

Behind the open and transparent information notification is the result of the Shanghai CDC and the virus racing against time.

They fought day and night, and a staff member said in an interview: They may call the citizens at two or three in the morning.

In the past five days, sleeping less than three hours a day is the norm for many "floating population". At the moment, their greatest wish is not to sleep for a while, but actually.

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"I hope you get our call, don't hang up. With a little more understanding, you can spend more time cutting off the spread of the virus. "