選択的
adult
background
blackboard
blank
board
caucasian
chalk
chalkboard
circle
classroom
drawing
education
foreground
frame
hand
human
illustration
imagination
isolated
learn
lesson
line
marker
message
one
pencil
people
person
planning
presentation
presenting
school
screen
seminar
showing
sign
sketch
student
study
teacher
teaching
triangle
university
white
writing
young
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