academic
audience
auditorium
background
banner
blur
boardroom
business
businessman
busy
class
classroom
college
communication
concept
conference
congress
convention
corporate
education
faculty
group
hall
information
knowledge
learn
learning
lecture
meeting
microphone
modern
note
people
person
presentation
professional
projector
public
room
school
screen
seminar
session
sitting
speaker
speech
study
teacher
training
workshop