Middle aged male teacher of mathematics drinking coffee and using laptop computer at work when delivering lecture on calculus to multi ethnic group of students
Middle aged curly haired teacher entering lecture hall, greeting multi ethnic group of students and starting lecture on calculus at university
Middle aged female university teacher in glasses smiling and talking to multi ethnic group of students when asking questions during lecture
Handheld shot of middle aged female professor in glasses delivering lecture to multi ethnic group of students at university
Handheld shot of middle aged university professor pointing at blackboard when asking question to student during lecture
Tracking shot of middle aged curly haired male professor talking to students when sitting in lecture hall at university
Handheld shot of middle-aged teacher of mathematics talking to multi ethnic group of students standing around him and answering their questions after lecture on calculus
Middle aged female professor in glasses taking notes in notebook and talking to students when listening to their answers during lecture at university
Medium shot of middle-aged teacher of mathematics standing at blackboard with equations written on it and explaining topic to students during lecture at university
Tracking shot of middle aged woman in glasses delivering lecture to group of students of different ethnicities sitting in lecture hall
Medium shot of curly haired middle aged university professor talking to group of students in lecture hall
e-learning at home by video chat, female student is listening lecture of middle-aged male teacher at screen of laptop