male person writing text with piece of chalk on blackboard, doing maths and physics equations
Palabras clave
chalk,
education,
male,
man,
blackboard,
person,
board,
teacher,
blackboard,
class,
school,
classroom,
college,
lecture,
study,
university,
write,
formula,
prof,
hand,
background,
mathematic,
science,
teaching,
writing,
drawing,
scientist,
academic,
cognition,
learn,
lesson,
physics,
presentation,
back,
student,
high school,
mathematic,
seminar,
note,
equation,
young
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