What's the difference between a travel card and a nucleic acid travel card?

"Travel Card", officially named "Communication Big Data Travel Card", is a travel inquiry service jointly launched by China ICT Institute, China Telecom, China Mobile and China Unicom under the guidance of the Ministry of Industry and Information Technology, which can provide users with free certificates of countries (regions) and domestic cities I visited in the past 14 days. The query result page of nucleic acid travel card will be marked with four colors: green, yellow, orange and red, and the rules will be adjusted in real time according to the actual situation.

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/kloc-Will the travel track be cleared automatically after 0/4 days?

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