back
black
blackboard
board
calculate
calculation
campus
chalk
chalkboard
class
classroom
close up
concept
education
equation
explaining
formula
help
high
homework
instruction
intelligence
learn
lecture
lesson
man
math
mathematical
mathematics
pen
pencil
people
person
physics
problem
remedial
research
room
school
science
student
study
studying
substitute
task
teach
teacher
tutor
university
write
定額
Professor writing mathematical formula and equation to blackboard in school classroom. College or university teacher or student with chalkboard. Science, education and math concept.の素材 [FY31095852754]
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