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 is teaching physics to students during the new school days after a long break, High school student classroom, Teacher is writing the instructional formula and explains how to do the exercises.の素材 [FY310156870970]
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