英文關鍵字
boys
caucasian
childhood
children
class
classmates
classroom
cute
desk
discipline
education
elementary
excitement
female
girl
girls
grade
group
hand
happy
indoors
kid
learn
learner
learning
lesson
lifestyle
listen
looking
male
motivation
people
person
raise
school
schoolboy
schoolchildren
schoolgirl
sitting
smiling
student
study
studying
teaching
teenage
together
university
working
young
youth