academic
activity
answer
asian
blackboard
boy
chalk
chalkboard
child
class
classroom
clever
concept
counting
education
elementary
explaining
genius
giving
glasses
hispanic
indonesian
japanese
kids
knowledge
learn
lesson
lifestyle
male
man
math
mathematics
number
people
primary
quiz
school
schoolboy
smart
student
study
teacher
teaching
test
writing
young
定額
Male teacher explaining a question of equations formula on the his student while standing in the classroomの素材 [FY310155017080]
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