英文關鍵字
2019ncov
antibacterial
antiviral
backdrop
bacteria
city
clean
cleaning
colorful
corona
coronavirus
covid
covid19
dangerous
dawn
disease
disinfect
disinfecting
disinfection
epidemic
health
liquid
man
medicine
outdoors
pandemic
people
pneumonia
public
quarantine
sanitary
sanitation
spray
spread
street
sun
sunny
sunset
surface
urban
virus
workers