英文關鍵字
backpack
boy
care
child
childhood
city
class
closed
college
corona
coronavirus
covid19
curly
cute
education
epidemic
face
flu
health
infection
kid
mask
outdoor
outdoors
people
person
portrait
prevention
primary
protection
protective
quarantine
risk
safety
school
schoolboy
schoolchild
schoolchildren
street
student
virus
wall
wearing
young