20s
adult
announcement
blackboard
caucasian
chalkboard
class
classroom
college
communication
education
female
holding
horizontal
indoors
knowledge
learning
lecture
loud
mathematics
megaphone
message
microphone
noise
one
people
person
professor
redhead
screaming
seminar
shouting
side
speaker
speech
student
teacher
university
view
woman
women
yelling
young