background
black
blackboard
board
business
chalk
chalkboard
class
classroom
college
doodle
drawing
education
equations
formula
green
hand
handwriting
knowledge
learning
lesson
math
mathematical
mathematics
number
physical
research
school
science
sign
sketch
student
study
studying
symbol
teacher
theory
university
white
write
定額
2D illustration of physical formulas, tasks, plots on a chalkboard.の素材 [FY31064224715]
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