Χαρούμενος δάσκαλος κρατώντας κιμωλία κοντά σε μαυροπίνακα και ψηφιακή φωτογραφική μηχανή στην τάξη - Φωτογραφίες & Εικόνες Αρχείου

Teacher holding chalk near blurred digital camera and chalkboard in class

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

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

Teacher in eyeglasses talking near blurred digital camera and chalkboard

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

Smiling teacher holding chalk near chalkboard with formulas and digital camera

Asian senior high school female teacher teach math online through camera in classroom

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

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

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

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

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

Low angle view of scientist with felt pen near blurred formulas on glass board

Smiling teacher looking away and pointing with finger near chalkboard

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

Smiling schoolboy using digital tablet near notebook

Shocked teacher touching face and pointing with finger near chalkboard