Teacher or teacher standing in front of blackboard and explaining something. Male character in eyeglasses pointing at blackboard with copy space for text

Education, training, explanation, lecture concept. Young hapy smiling man guy student teacher lecturer character explaining material on school lesson near blackboard. Educational process at university

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圖片庫的Education, training, explanation, lecture concept. Young hapy smiling man guy student teacher lecturer character explaining material on school lesson near blackboard. Educational process at university 圖片 Image 157298915.

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Education, Training, Explanation, Lecture Concept. Young Hapy Smiling Man Guy Student Teacher Lecturer Character Explaining Material On School Lesson Near Blackboard. Educational Process At University 免版稅剪貼畫，向量插圖和庫存圖片. Image 157298915.

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Education, training, explanation, lecture concept. Young hapy smiling man guy student teacher lecturer character explaining material on school lesson near blackboard. Educational process at university

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