Man in glasses standing at the bookshelf. Education concept.

Man on nervous face between piles of books in library, bookshelves on background. Teacher or student with beard wears eyeglasses, sits at table with books, defocused. Scientific discovery concept

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图像库的Man on nervous face between piles of books in library, bookshelves on background. Teacher or student with beard wears eyeglasses, sits at table with books, defocused. Scientific discovery concept 图像 Image 102497018.

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Man On Nervous Face Between Piles Of Books In Library, Bookshelves On Background. Teacher Or Student With Beard Wears Eyeglasses, Sits At Table With Books, Defocused. Scientific Discovery Concept 正版图像 123RF中国 - 高质量免版税图像库. Image 102497018.

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Man on nervous face between piles of books in library, bookshelves on background. Teacher or student with beard wears eyeglasses, sits at table with books, defocused. Scientific discovery concept

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