albert
algebra
background
black
black board
blackboard
board
chalk
chalkboard
college
complex
concept
dust
education
energy
equation
equivalence
formula
handwriting
horizontal
law
learn
lesson
light
mass
math
mathematical
mathematics
matter
nobody
pattern
physics
problem
research
school
science
smudge
speed
student
study
studying
subject
teach
teacher
texture
university
white
word
write
定額
Handwritten physics word and formula E=mc2 on chalkboard, gray backgroundの素材 [FY31069791462]
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