Teacher pouring chemical into test tube with his student .
Schlüsselwörter
teacher,
education,
chemistry,
experiment,
school,
laboratory,
chemical,
science,
laboratory,
young,
classroom,
class,
study,
learning,
tube,
stem,
equipment,
student,
test,
lesson,
people,
girl,
group,
children,
student,
boy,
elementary,
children,
childhood,
research,
studying,
high,
person,
happy,
looking,
children,
biology,
cognition,
discovery,
scientist,
glassware,
caucasian,
working,
man,
teenage
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