35s
adult
african
american
book
class
college
course
education
female
group
indoors
knowledge
learning
lecture
lecturer
lesson
listen
listeners
male
man
mask
meeting
people
presentation
professional
professor
protective
room
seminar
session
speech
standing
student
studying
talk
teacher
teaching
training
tutorial
woman
定額
African-american student wearing protective mask among students in classroomの素材 [FY310161036486]
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