analysis
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caucasian
chemical
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class
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cognition
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confidence
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elementary
elementary school
experiment
happiness
horizontal
indoor
instruction
intelligence
kid
knowledge
lab
learning
lesson
liquid
medicine
microscope
person
pupil
research
school
schoolgirl
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smart
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study
studying
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test
tube
定額
Caucasian teacher helps student mixed liquid in science laboratory. Professional instructor support smart boy doing experiment in STEM science class at blackboard written chemical theory. Erudition.の素材 [FY310228605166]
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