英文關鍵字
2019ncov
arm
background
blue
breathing
clean
closeup
concept
coronavirus
covid
covid19
crisis
deficiency
deficit
disposable
epidemic
equipment
filter
grey
h1n1
hand
health
healthcare
infected
infection
isolated
mask
medical
medicine
motion
object
overcharge
pandemic
protect
protection
protective
quarantine
safety
scarcity
science
shortage
sick
slow
stack
virus
white