abc
alphabet
back to school
background
blackboard
board
chalk
chalkboard
chart
childhood
class
classroom
college
education
elementary
grade
homework
illustration
information
inscription
language
learn
learning
lecture
lesson
manual
material
math
notes
numbers
period
primary
quiz
reading
research
school
student
study
studying
symbol
teacher
teaching
work
writing
youth
定額
Blackboardの素材 [FY3107385784]
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