adviser
academy
addition
background
board
book
calculate
calculation
caucasian
chart
class
classroom
closeup
confident
count
education
elementary
explain
happy
high school
hold
isolated
learn
lesson
looking
marker
math
mathematics
number
person
physics
primary
professional
school
secretary
showing
standing
student
study
studying
sum
teach
teacher
teaching children
university
white board
whiteboard
woman
write
定額
Teacher asks a staircase or university student to prepare for teaching and work in the teacher room, Pre-teaching preparation or pre-work lesson, back to school concept.の素材 [FY310191742598]
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