Ключевые слова: adult, announce, audience, board, business, businessman, colleague, conference, corporate, doctor, executive, explain, giving, glasses, hand, handsome, happy, indoor, library, male, man, meeting, people, person, phd, present, presentation, presenter, presenting, project, projector, research, science, scientific, scientist, search, showing, smiling, speach, speak, speech, student, success, talk, teaching, training, university, white, whiteboard, young,