英文關鍵字
air
allergy
antihistamines
antiviral
bacteria
breath
city
clean
contagion
contagious
cough
danger
diseased
dust
environment
environmental
face
fear
filter
flu
gas
gasoline
health
ill
infection
influenza
isolated
lady
mask
medical
medicine
nature
outbreak
pandemic
patient
person
polluted
pollution
prevention
protect
protection
protective
safe
safety
sick
sore
suffer
unwell
virus