英文關鍵字
adult
air
allergy
background
bacteria
black
care
caucasian
close
concept
corona
coronavirus
covid19
danger
dark
disease
epidemic
face
flu
health
human
ill
illness
infect
infection
influenza
lifestyle
male
man
mask
medical
medicine
mouth
pandemic
people
person
pollution
portrait
prevention
problem
protect
protection
protective
quarantine
risk
safety
science
sick
surgical
toxic
virus
wearing
world
young