20s
academic
adult
african american
american
assistance
attractive
background
black
blackboard
board
book
caucasian
chalk
chalkboard
cheerful
class
classroom
college
education
exam
explain
female
formula
girl
happy
intelligent
learning
lesson
looking
male
mathematic
person
portrait
pretty
school
science
smart
smile
standing
student
studying
teacher
together
tutor
university
woman
writing
young
young adult
定額
Hand Holding pen and Writing Complex and Sophisticated Mathematical Formula/ Equation on the Blackboardの素材 [FY310177780389]
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