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Üst düzey kimya profesörü tahtaya tebeşir ve blackboard bir ders yaparken yazma

Üst düzey kimya profesörü tahtaya tebeşir ve blackboard bir ders yaparken yazma - Stok Fotoğraf ve Görsel

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Senior chemistry professor writing on the board while having a chalk and blackboard lecture

Senior chemistry professor writing on the board while having a chalk and blackboard lecture (shallow DOF, color toned image)

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Math teacher by the blackboard during mathclass - detail of the hand with chalk

Senior chemistry professor writing on the board while having a chalk and blackboard lecture

Senior chemistry professor writing on the board while having a chalk and blackboard lecture (shallow DOF, color toned image)

Mathematical formulas on dark black chalk board closeup

Senior chemistry professor writing on the board while having a chalk and blackboard lecture

$Math teacher by the blackboard during mathclass - detail of the - Fotoğraf, Görsel$

Math teacher by the blackboard during mathclass - detail of the hand with chalk

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Math teacher drawing fuction graph on a blackboard during mathclass (motion blurred image)

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Blackboard with math lesson written on it

$Math teacher by the blackboard during mathclass - Fotoğraf, Görsel$

Math teacher by the blackboard during mathclass - detail of the hand with chalk

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Math teacher drawing fuction graph on a blackboard during mathclass (motion blurred image)

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Senior math teacher teaching mathematics, writing on the blackboard during class

Pretty, young college student writing on the chalkboard/blackboard during a math class (colort toned image; shallow DOF)