academic
academy
adult
algebra
back
background
board
calculation
caucasian
chalk
chalkboard
class
classroom
college
communication
confident
course
education
educational
explain
explaining
formula
green
indoors
intelligence
knowledge
learn
learning
lecture
lesson
male
man
math
mathematics
mature
occupation
person
professional
school
smart
study
teach
teacher
training
tutor
university
view
work
write
written
定額
Mature teacher explaining mathematics at chalkboard in classroomの素材 [FY310192088316]
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