英文關鍵字
aerosol
animal
automation
ball
conceal
concept
coronavirus
covid19
debtor
diseased
doctor
environmental
epidemic
epidemics
green
group
health
infected
inspire
lack
man
mask
medical
mine
model
modern
mumps
overall
patient
problem
protect
protection
rare
respirator
safety
show
sick
sneeze
spike
surprise
thorn
tired
trademark
vaccine
virus
wearing
woman
worker