英文關鍵字
1080p
academic
apple
attentively
black
blackboard
boy
chalkboard
child
childhood
class
classmates
classroom
concentrated
concentrating
cute
definition
desk
development
early
education
elementary
female
focused
girl
hd
high
highdef
knowledge
learn
learning
lesson
male
mixedrace
people
preschool
pupil
school
schoolchild
serious
studying
thoughtful
two
ultra
writing