blackboard
boys
casual
caucasian
chalk
chalkboard
cheerful
class
classmates
classroom
college
education
educator
female
girls
group
handsome
happy
high school
indoors
learners
learning
lecture
lesson
male
math
mathematics
mature
men
mid age
middle aged
middle school
modern
people
school
senior
smiling
students
studying
teacher
teaching
teen
teenage
teenager
women
writing
young
young adult
youth
定額
senior high school teacher teaching math in classroomの素材 [FY31020235432]
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