college teacher
60s
adult
arithmetics
beard
blackboard
class
classroom
college
communication
diagram
education
explaining
formula
geometry
glasses
high school
high school teacher
instructor
job
knowledge
learn
looking
male
man
mathematics
maths
occupation
one
one person
people
person
pointing
profession
professional
professor
school
senior
solution
solving
study
studying
teacher
teaching
trigonometry
university
university teacher
working
writing
定額
Senior math teacher teaching mathematics, writing on the blackboard during classの素材 [FY310146576487]
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