Cartoon of Chemistry Professor standing in front of blackboard conducting a science experiment
ProfessorOfChemistry
blackboard、cartoon、chalkboard、Chemie、chemistry、classroom、experiment、lesson、professor、science、teacher
黑板、動畫片、黑板、化學、化學、課堂、實驗、課、教授、科學、老師
資料來源：openclipart ( https://openclipart.org/ )