Teacher writing on blackboard in classroom.
Schlüsselwörter
classroom,
teacher,
student,
school,
education,
learning,
blackboard,
teaching,
lesson,
class,
desk,
bookshelf,
clock,
window,
mathematic,
problem,
equation,
chalk,
writing,
standing,
pointing,
people,
children,
children,
sitting,
attentive,
colourful,
illustration,
cartoon,
indoor,
scene
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