analysis
background
board
chalk
chalkboard
chemical
chemistry
classroom
closeup
college
educate
education
exam
formulas
green
handwriting
intelligence
knowledge
learn
learning
lecture
lesson
lifestyle
molecular
object
reaction
research
school
schooling
science
sign
solution
stud
student
study
studying
symbol
teach
teacher
teaching
training
university
white
wooden
written
定額
Chemical formulas written with chalk on green board, closeupの素材 [FY310232062646]
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