academic
blackboard
board
chalkboard
chemical
chemist
chemistry
class
classroom
demonstrating
discovery
discussing
doctor
education
experiment
experimenting
explaining
fluid
glass
learning
lecture
lecturer
lesson
liquid
looking
man
mentor
mentoring
old
presenting
research
researcher
sample
school
science
scientific
scientist
showing
solution
study
studying
substance
teacher
teaching
test
testing
tube
tubing
tutor
tutoring
定額
Old male chemist teacher in the classroomの素材 [FY310177072061]
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