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What do you mean by active cross-regional investigation?

It means to conduct a work inspection across regions. For example, there was a case of COVID-19 in Xiamen, and the case of COVID-19 came from Putian, so Xiamen sent people to Putian to investigate and report. This survey report is a cross-border survey of two regions. The epidemic situation in COVID-19 often requires cross-regional investigation, and they cooperate with each other from one region to another.