adult
blur
broadcast
brunette
caucasian
chalk
chalkboard
cheerful
classroom
content
course
digital camera
distance
education
elearning
electronic
emotion
explain
eyeglasses
gesture
happy
indoors
internet
job
knowledge
lecture
lesson
math
mathematics
one person
online
point with finger
positive
professional
remote
school
service
signs
smiling
streaming
symbols
teacher
technology
tutor
vlog
woman
work
workplace
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Teacher in eyeglasses explaining math formulas on chalkboard near digital camera in classの素材 [FY310188501684]
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