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/ )
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