adult
aged
algebra
blackboard
board
caucasian
chalk
chalkboard
cheerful
class
classroom
college
diagram
education
equation
explaining
eyeglasses
formula
geometric
geometry
green
green board
handsome
high school
indoors
intelligent
job
knowledge
lecturer
lesson
male
man
math
mathematics
person
portrait
profession
professor
school
smart
smile
teacher
teaching
university
writing
young
定額
The teacher teaches how to count on the board in the classroom. Smiling man explains additions in a column in class. A math teacher explains arithmetic sums to younger children.の素材 [FY310213973172]
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