academic
adult
algebra
background
blackboard
board
caucasian
chalk
chalkboard
class
classroom
college
concept
education
equation
exam
female
formula
green
happy
high
intelligent
job
knowledge
learn
learning
lecturer
lesson
male
man
math
mathematics
occupation
people
person
portrait
pretty
professor
school
science
smile
standing
student
study
teach
teacher
tutor
university
woman
young
定額
Young female teacher in the school room during class, near chalkboard with written math formulas. educationの素材 [FY310184986400]
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