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

Grey hair professor pointing on something with finger at blackboard

Grey hair professor pointing on something with pencil on blackboard

Happy senior lecturer holding paper plane in hand

Pensive grey hair professor standing at blackboard with piece of chalk

Grey hair professor looking at students rising hands

Side view of grey hair professor drawing with piece of chalk at blackboard

Happy senior lecturer with open arms standing near blackboard

Grey hair professor pointing on something with wooden pointer

Cropped image of senior professor pointing on something with pencil on blackboard

Cropped image of professor drawing with piece of chalk at blackboard

Focused senior writer reading manuscript with magnifying glass

Bearded senior writer reading manuscript with magnifying glass

Smiling elderly man looking at camera while holding laptop isolated on grey

Thoughtful senior writer holding stack of books

African american teacher writing on chalkboard near blurred laptop during video call in classroom

Serious senior man writing in notebook with pencil

Senior man in tweed suit reading notes in notebook with magnifying glass

Senior man in tweed suit writing letter in front of white brick wall