function
analysis
atom
background
blackboard
calculation
calculus
chalk
chalkboard
chemical
chemistry
classroom
closeup
college
different
educate
education
element
equation
examples
exercise
formula
formulas
intelligence
knowledge
laboratory
learn
learning
lecture
lesson
lifestyle
many
math
mathematical
molecular
nobody
numbers
object
reaction
research
school
science
solution
study
studying
symbol
university
wall
white
written
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Different chemical formulas written with chalk on blackboard, closeupの素材 [FY310196227766]
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