adult
analysis
analyzing
beaker
biology
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boy
caucasian
chemical
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chemistry
class
classroom
cognition
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elementary school
experiment
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highschool
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laboratory
learning
lesson
liquid
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pupil
research
school
schoolgirl
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study
studying
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teenage
test
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定額
Smart teacher explain about chemical theory while student mixing colored solution or doing experiment. Instructor teaching chemistry while pointing at blackboard in STEM science class. Edification.の素材 [FY310225755100]
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