abstract
bearded
biochemistry
biology
biotechnology
blackboard
board
chalk
chalkboard
chemical
chemist
chemistry
class
classroom
coat
college
diagram
discovery
education
experiment
formula
glass
goggles
graduate
infection
knowledge
lab
laboratory
lecture
lesson
male
man
math
mathematics
medical
medicine
microbiology
middleaged
pharmacology
physics
professor
school
science
secondary
senior
students
teacher
white
work
定額
Chalk board. Close-up of human hand writes formulas on physics and chemistry in school and university.の素材 [FY31096974201]
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