英文關鍵字
2019ncov
air
attractive
beautiful
break
bridge
casual
city
contactless
coronavirus
covid19
education
epidemic
girl
health
hygiene
infection
lake
mask
masks
medical
nature
outdoor
pandemic
park
prevention
protection
protective
quarantine
risk
safety
school
schoolgirl
schoolgirls
skate
start
student
virus
walk
wearing
young