Portrét učitele exited muž a dívka student vědci, kteří experiment v laboratoři - Stock fotografie a obrázky

Portrait of smiling man teacher looking at excited girl student during experiment in lab

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Smart boy and girl mixing liquids in flask while conducting chemical experiment in modern laboratory in school

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Scientist showing laboratory tube, focus on foreground

Portrait of cheerful scientist showing laboratory tubes and looking to camera

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Young male chemist holding flask with green liquid

Smiling scientist holding molecular model in laboratory, focus on foreground

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Young confident woman scientist in lab coat holding digital tablet and looking at camera