achiever
black
blackboard
boy
caucasian
chalk
chalkboard
child
childhood
classroom
clever
concept
educate
education
elementary
emc2
expertise
face
finger
formula
funny
genius
glasses
happiness
happy
indoors
intelligence
knowledge
learn
learning
looking
math
mathematics
one person
physics
pointing
posing
preschool
pupil
school
schoolboy
smile
solution
solve
student
study
studying
success
wisdom
定額
Schoolboy showing the the mass-energy equivalence formula on a blackboardの素材 [FY31011679639]
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