abstract
audience
auditorium
background
blue
blurred
business
chairs
coaching
color
computer
conference
congress
convention
culture
education
empty
equipment
event
group
hall
lecture
light
man
meeting
microphone
modern
new
nobody
office
over
pattern
people
podium
presentation
professional
public
room
rostrum
screen
seminar
sitting
speaker
speaking
speech
stage
table
training
tribune
university
定額
microphone in conference hallの素材 [FY310146106714]
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