Table 6.

Topic distribution of citizens' microblog (Provinces of imported cases).

Topic	High operating period				Median operating period
	Returning to work and school	Food and entertainment	Epidemic prevention	Emotional attitude	Returning to work and school	Epidemic prevention	Emotional attitude	Closed city
Key words	school, college entrance examination, work, earn money, online courses, express delivery, go out to play, want to see, resume work	Hotpot, Spicy Hot, Milk Tea, Strawberry, Milk Tea, Liangpi, Zheng Shuang, Fan, Xiao Zhan	epidemic situation, prevention and control, medical treatment, masks, anti-epidemic, body temperature measurement, diagnosis, ambition, fight	sunny, spring, bored, scared, painful, lonely, beautiful, happy, cute, happy	health certificate, certificate, processing, office, work, rework, pass	Zero growth, improvement, isolation, cure, death, hardcore, prevention and control, epidemic prevention	steady, less and less, understand, hold on, happy, panic, angry, face	fully closed, advised to return, unable to enter, cleared, opened to traffic, returned to normal