formal education girls and boy student conduct school experiment with liquids laboratory group pupils |
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| navigate by keyword : adorable biology boy caucasian chalkboard chemical chemistry child childhood children concept conduct education experiment formal girls group intelligent invent inventors kids knowledge laboratory learning lesson liquids little microscope practice pupil pupils school schoolgirl smart student students study subject substances task test tubes uniform |
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| Formal education. Girls and boy student conduct school experiment with liquids. School laboratory. Group school pupils study chemical liquids. School chemistry lesson. Test tubes with substances. |
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