adolescence
40s
adult
african american ethnicity
asian chinese ethnicity
attention
black
book
classroom
communication
desk
diversity
education
explaining
girls
guidance
helping
high school
indoors
kids
knowledge
leaning
learning
lesson
listening
mentoring
middle aged
pupils
school
schoolboys
schoolchildren
schoolgirls
selective focus
showing
sitting
standing
students
tablet computer
talking
teacher
teaching
technology
teenagers
three people
using computer
vertical
waist up
woman