background
blackboard
calculation
chalk
chalkboard
class
college
concept
drawing
e
education
educational
energy
equation
figure
formula
frame
genius
handwriting
knowledge
learn
lesson
light
mass
math
mathematical
mathematics
mc
mc2
number
pattern
physics
relativity
research
school
science
solution
speed
study
symbol
theory
university
white chalk
write
定額
E=mc2 handwritten with white chalk on a blackboardの素材 [FY31014401593]
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