60s
academic
adult
age
blackboard
board
caucasian
chalk
chemistry
class
classroom
college
education
education school
educational
educator
elderly
emotion
explaining
expression
faculty
formula
frustrated
graduate
instructor
intelligent
learn
lecture
man
mature
old
person
portrait
professor
senior
senior professor
serious
teacher
teaching
times
university
wisdom
定額
Frustrated senior teacher standing in front of a chalk board.の素材 [FY310226774987]
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