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bald security guard with the headset to control people . heated debate at a conference discussion . Unrecognizable man using headphones for translation during video conference .
Keywords:
men
education
seminar
rear view
spectator
projection screen
indoors
crowd
audience
lecture hall
group of people
sitting
classroom
projection equipment
professor
learning
people
university
video classroom
security guard
security guards
control group
video security man
people debating
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