Selektywne skupienie dzieci mieszanie płynów w pobliżu chłopca - Materiał filmowy & wideo

Happy boy talking while adding liquids

Happy kid waving hands in laboratory

Elementary School Science Classroom: Smart Boy Mixes Chemicals in Beakers and Cute Girl Writes Down and Analyzes Results with Digital Tablet Computer. Modern Education, Learning Chemistry

Elementary School Science Classroom: Smart Boy Mixes Chemicals in Beakers and Cute Girl Writes Down and Analyzes Results with Digital Tablet Computer. Modern Education, Learning Chemistry

A kid boy pouring liquid into a tube

Happy boy talking while adding liquids

Happy kid waving hands in laboratory

Focus pull of boy holding tooth

Front view of happy schoolgirl putting copy book on head, laughing, sticking out tongue, looking around and taking pen

Front view of smiling preteen boy sitting at desk, showing thumbs up and rock signs, making funny faces and putting book on head

Rack focus of kid looking at burning powder