Szürke haj professzor mutató valamit az előadóterem - Stock fotó és kép

Senior lecturer holding piece of chalk and looking away

Senior lecturer pointing on something in lecture room

Senior lecturer leaning on table and looking away

Grey hair professor pointing on something at blackboard

Smiling grey hair professor holding stack of books with apple on top

Smiling grey hair professor holding piece of chalk

Happy senior lecturer buttoning shirt

Smiling grey hair professor holding wooden pointer

Positive senior man talking on smartphone and pointing with finger isolated on grey

Serious senior man in tweed suit and glasses looking at camera

Elderly man in bow tie and blue jacket using smartphone isolated on grey

Smiling elderly man in eyeglasses and bow tie looking at camera isolated on grey

Elderly man in shirt and jacket using smartphone isolated on grey

Smiling senior man looking at camera while touching jacket isolated on grey

Excited senior man in bow tie pointing with fingers at camera isolated on grey

Confused senior man showing dubium gesture while looking at camera isolated on grey