Μαθητής στην τάξη της χημείας. πίσω στο σχολείο. Εκπαιδευτική ιδέα. ένας μικρός επιστήμονας που κάνει πειράματα στο εργαστήριο. Εργαστήριο χημείας του σχολείου. Συμπυκνωμένο αγόρι που δεν μελετάει στο σχολείο - Φωτογραφίες & Εικόνες Αρχείου

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