digital tablet
デジタルタブレット
african american
black woman
boy
caucasian
child
childhood
classroom
device
ecology
education
elementary age
elementary school
elementary student
energy
environment
explain
girl
indoors
innovation
kid
knowledge
knowledgeforall
learn
lesson
power
pupil
school
school children
schoolboy
schoolchildren
schoolgirl
student
study
system
teach
teacher
technology
windmill
woman