英文關鍵字
adult
air
airborne
caucasian
contagious
corona
danger
disease
epidemic
face
female
filter
flu
health
healthcare
illness
infection
influenza
korea
male
mask
medical
metro
novel
person
pollution
prevention
protect
protection
public
respirator
respiratory
safety
sick
spread
subway
train
transport
transportation
underground
urban
viral
virus
wear
woman