Σοκαρισμένος δάσκαλος αγγίζοντας γυαλιά, ενώ κρατώντας ψηφιακό δισκίο με λευκή οθόνη κοντά στον πίνακα - Φωτογραφίες & Εικόνες Αρχείου

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Teacher in eyeglasses explaining math formulas on chalkboard near digital camera in class

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