What does it mean that you are not allowed to leave the village in principle without nucleic acid?

According to the regulations, you can't leave the village without nucleic acid. Principle refers to the phenomenon of rationalization after long-term experience summary, that is, the summarized provisions. Not doing nucleic acid will affect normal travel. In principle, you are not allowed to leave the village. It means that you can't leave the village without doing nucleic acid according to the regulations. If you don't do nucleic acid for a limited time, the mobile phone will turn from green to yellow and finally to red. Can't go in and out of public places, can't take the bus, can't go out.