英文關鍵字
academic
back
backpack
books
building
campus
city
class
college
corona
coronavirus
covid
covid19
distance
education
exam
girl
hand
health
high
immunization
learning
mask
medical
medication
next
outdoor
pandemic
people
person
plaster
portrait
prevention
protection
reading
safe
safety
school
standing
street
student
students
study
teen
teenager
test
university
vaccinated
vaccination
vaccine
virus
walking
woman
young