Teacher at the blackboard
Palabras clave
blackboard,
classroom,
education,
formula,
instructor,
learning,
mathematic,
prof,
school,
teaching,
training,
adult,
board,
caucasian,
chalk,
class,
college,
diagram,
drawing,
hall,
hand,
intelligence,
male,
man,
mathematic,
mathematical,
man,
people,
person,
physics,
presentation,
ruler,
science,
seminar,
signs,
solution,
speech,
strategy,
study,
studying,
success,
symbol,
talking,
teacher,
theory,
university,
wisdom,
write,
writing,
businessman
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