adult
attractive
audit
biology
blackboard
blond
board
caucasian
chalk
chalkboard
chemistry
class
classroom
development
doctor
education
expertise
female
formulas
instructor
lab
laboratory
lecture
looking
mathematics
medical
medicine
numbers
people
person
portrait
professional
professor
research
researcher
school
science
scientist
seminar
student
study
teacher
teaching
university
white
woman
women
worker
write
young
定額
A young woman draws something on the blackboardの素材 [FY31033303417]
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![Ice and snow Songhua River city buildings on the Bank of Songhua River in winterの素材 [FY31093443321]](https://images.assetsdelivery.com/compings_v2/faw1047a/faw1047a1801/faw1047a180100116.jpg "Ice and snow Songhua River city buildings on the Bank of Songhua River in winterの素材 [FY31093443321]")