Siwe włosy profesor wskazuje na coś na tablicy - Zdjęcie stockowe & obraz

Grey hair professor pointing on something at lecture hall

Grey hair professor pointing on something at blackboard

Senior lecturer holding piece of chalk and looking away

Senior lecturer leaning on table and looking away

Senior lecturer pointing on something in lecture room

Smiling grey hair professor holding wooden pointer

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

Happy senior lecturer buttoning shirt

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

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

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

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

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

Grey haired man in shirt and jacket smiling at camera while holding laptop isolated on grey

Elderly man in shirt and jacket using smartphone isolated on grey

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

Thoughtful senior writer sitting at workplace and looking away isolated on black