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2019ncov, air, airborne, background, bacteria, blue, care, chinese, clock, contagious, coronavirus mask, covid19, danger, disease, environmental pollution, epidemic, face, female, flu, girl, health, hours, hygienic, immunity, infection, late, lifestyle, mask, medical, medicine, minutes, patient, people, plants, prevention, protection, protective, protective mask, quarantine, respiratory, safety, time, viral, virus, viruses, wearing, woman, work, young,