adult teaching portrait senior teacher line high school students with notebook classroom |
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| navigate by keyword : teacher classroom university college tutorial exam educate adult lecture classmates teaching aged educator notebook professor retirement book textbook class school learning indoors smart academy age retired learn knowledge caucasian elderly study male teach lesson write mature educational blackboard courses tutor senior explain studying course portrait education faculty desk man chalkboard grandfather old academic institute training student |
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| Adult teaching. Portrait of senior teacher teaching line of high school students with notebook in classroom on blackboard |
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