英文關鍵字
medium
group
of
people
child
girl
female
black
mid
adult
man
male
caucasian
teenager
boy
chinese
mixedrace
baby
animation
graph
diverse
teacher
student
watching
educational
video
laptop
digital
composite
multiple
exposure
report
childhood
togetherness
technology
concept
chart
education
school
kid
learning
study
computer
diagram
studying
classroom
college
learn
university
class
knowledge
lesson
little
online
internet
notebook