英文關鍵字
adult
attention
beautiful
blackboard
board
class
classroom
close
closeup
course
desk
discipline
educate
education
elementary
equations
exam
happy
helping
job
learn
learning
lesson
looking
math
mathematic
occupation
positive
preschool
primary
principal
profession
professional
school
smile
smiling
student
study
studying
subject
task
teacher
teaching
tutor
up
woman
work
working
young