Close up back view of male teacher lecturing university students, shot on R3D
Close-up portrait of a young man engaged in an intense conversation.
Defense of doctoral dissertation. The board members sit in the conference room. View of tribune from audience
Male teacher with university students in lecture theatre
Teacher addressing students in a university lecture theatre
Angry african american man fighting with friend over debacle, isolated over studio background. Rude person in disagreement with mate
Female teacher and students in university lecture theatre
Disappointed indian man admonishing friend over debacle, isolated over studio background. Upset person in disagreement with mate, pointing
Concerned mother addressing her upset child in the living room at home
African American vlogger woman recording a video on smartphone - content creation concept.
Angry female boss shouting at workers.
Young Indonesian actor in traditional costume with sward in her hand - martial arts teacher lecturing her student with a stern expression, female warrior pushing opponent to the ground
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Disappointed man admonishing friend over debacle, isolated over blue studio background. Upset person in disagreement with mate, pointing
Disappointed indian man admonishing friend over debacle, isolated over studio background. Upset person in disagreement with mate, pointing
Close up of female teacher lecturing university students, shot on R3D
Vertical shot of female professor lecturing students on psychology topic with help of modern technology such as display and remote controller
Angry man fighting with friend during videocall on tablet, isolated over studio background. Rude person in disagreement with mate, swearing
Angry man fighting with friend during videocall on tablet, isolated over studio background. Rude person in disagreement with mate, swearing
Female Indonesian martial arts teacher lecturing her students wearing traditional costumes
Man in his 40s giving a lecture on organic chemistry pointing to a formula on a blackboard in a high school or college classroom
Teacher at lectern in lecture theatre presenting to students, shot on R3D
adult man is conducting webinar, talking at web camera of laptop, blogger or specialist is lecturing from apartment
Senior long-bearded man giving speech with microphone indoor. Serious old long-bearded businessman's lecturing, indoor windows background.
Female science professor in lab coat recording lesson with camera while explaining educational material to students at desk in front of blackboard with formulas and equations in university classroom.
Young Businessman Giving a Presentation - Green Screen Isolated
Students in university lecture seen over teacher?s shoulder, shot on R3D
Misbehaving African American adolescent girl grimacing saying bla-bla as unrecognizable man gesturing at background. Unknown angry father scolding bored daughter at home. Adolescence and education.
Young Indonesian actor in traditional costume with sward in her hand - martial arts teacher lecturing her students with a stern expression, royal commander trains her troops to learn self-defense
Male teacher in lecture theatre presenting to students
Young Indonesian actor in traditional costume with sward in her hand - martial arts teacher lecturing her students with a stern expression
Defense of doctoral dissertation. The board members sit in the conference room.
Young Indonesian actor in traditional costume with sward in her hand - martial arts teacher lecturing her students with a stern expression, royal commander trains her troops to learn self-defense
Young Indonesian actor in traditional costume with sward in her hand - martial arts teacher lecturing her students with a stern expression, royal commander trains her troops to learn self-defense
Young Man Drawing Diagram on Flipchart
Male student raising his hand to answer a question from his teacher in a high school or college classroom
Teacher in lecture theatre presenting to students, pan, shot on R3D
Teacher at lectern and students in lecture theatre, close up
Defense of doctoral dissertation. The board members sit in the conference room. The tribune is visible. Slow motion.
old teacher is lecturing online, staying home and communicating with pupils by internet
Skilled woman teaching online with laptop and headphones, supported by husband. Expert consultant conducting video meeting at home.
Young doctor explaining chemical compounds on hospital poster
Female boss disappointed in her workers.
Angry boss talking with employees.
Young Indonesian actor in traditional costume with sward in her hand - martial arts teacher lecturing her students with a stern expression
Close up of confident male professor sitting on couch and lecturing at home. Young Afro American man in glasses video conferencing, teaching
Close-up of focused mother discussing with her upset child in living room
woman dietologist is conducting webinar, sitting in front of laptop and looking at web camera, speaking and lecturing
A diverse group of employees express their frustration with their boss at a corporate meeting in an office space