Δάσκαλος γυαλιών που εξηγεί μαθηματικούς τύπους σε πίνακα κοντά σε ψηφιακή φωτογραφική μηχανή στην τάξη - Φωτογραφίες & Εικόνες Αρχείου

Teacher talking near blurred digital camera and chalkboard with math formulas in classroom

Teacher holding chalk and talking near chalkboard with formulas and digital camera

Teacher talking near math formulas on chalkboard and blurred digital camera in classroom

Teacher holding chalk near blurred digital camera and chalkboard in class

Teacher talking near digital camera and chalkboard with math formulas in class

Teacher in eyeglasses talking near blurred digital camera and chalkboard

Teacher talking near math formulas on chalkboard and digital camera in class

Tutor pointing at chalkboard and holding digital tablet near camera in school

Teacher pointing at math formulas on chalkboard during online lesson in class

Shocked geometry teacher touching face and pointing with finger at chalkboard with illustration

Shocked teacher touching face and pointing with finger near chalkboard

Smiling teacher looking away and pointing with finger near chalkboard

Low angle view of blurred chemist holding clipboard and felt pen near chemical formulas on glass board

Shocked teacher touching glasses while holding digital tablet with blank screen near chalkboard

Brunette doctor in white coat writing chemical formulas on glass board in lab

Blurred doctor with felt pen and clipboard writing chemical formulas on glass board

Serious teacher in eyeglasses looking at camera while standing near chalkboard