英文關鍵字
apartment
back
book
boy
caucasian
child
childhood
closeup
desk
doing
education
elementary
hands
home
homework
indoor
kid
knowledge
learning
lesson
math
mathematics
motion
notebook
notepad
one
paper
paperwork
pen
person
pupil
room
school
schoolboy
schoolchild
schoolkid
sitting
slow
smart
solving
student
studying
table
teaching
teenager
texting
unrecognizable
view
working
writing
young