arm
back
backgrounds
blackboard
blank
building
chalk
classroom
close up
copy
education
efficiency
elementary
empty
equal
expertise
formula
frame
full
green
hand
high
human
instructor
learning
mathematical
mathematics
message
nobody
number
school
secondary
sign
studying
symbol
teacher
teaching
text
university
writing
定額
A hand holding chalk, about to write something on a chalkboard.の素材 [FY31010871621]
この写真素材のタグ
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