School boy in class shows empty blackboard
Schlüsselwörter
school,
children,
boy,
blackboard,
gown,
mask,
facial,
health,
desk,
pandemic,
virus,
instruction,
poster,
table,
standard,
prevention,
student,
tip,
blank,
mathematic,
science,
class,
chalk,
studies,
learning,
childhood,
wise,
cognition,
formula,
development,
education,
background,
schoolboy,
care,
crayons,
children,
cute,
classroom,
study,
lesson
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