Mladý přednášející stojí před tabulí. Učitel ukazuje na prázdnou bílou tabuli a drží značku v přednáškovém sále. - Stock fotografie a obrázky

Teacher standing at whiteboard in lecture hall. Male lecturer with formal clothes holding marker and explaining in front of a whiteboard.

Professional young man pointing at whiteboard and holding marker. Young lecturer standing in front of the whiteboard and explaining lecture.

Elegant male speaker showing presentation on whiteboard. Portrait of a male lecturer pointing at whiteboard and coaching.

Male lecturer with marker looking at a whiteboard. Lecturer wearing glasses standing in front white board and holding marker.

Portrait of young teacher writing on whiteboard in classroom

Presenter standing in front of a blank paper whiteboard. Male lecturer with glasses pointing at flip chart board in the office.