Three students work on science experiments together at a table they use lab equipment like test tubes and microscopes the setting 免版税图库摄影 three students work on science experiments together at a table they use lab equipment like test tubes and microscopes the setting
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Three children are in a classroom doing science experiments one operates a microscope while the other two observe and handle 免版税图库摄影 three children are in a classroom doing science experiments one operates a microscope while the other two observe and handle
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