adult
black board
board
caucasian
class
classroom
college
computer
concept
discussion
education
formular
group
hand
happy
indoors
learning
lesson
male
meeting
men
modern
people
person
physics
professor
project
school
show hand
smiling
student
students
studying
teacher
teachers
teaching
team
teamwork
technology
training
tutor
university
up
white board
working
young
定額
Asian teacher Giving Lesson over the the physics formular with thailand text language on white board in science laboratory classroom,school education concept,The teacher wrote himselfの素材 [FY31084490469]
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