英文關鍵字
arithmetic
assimilation
background
blackboard
board
book
caucasian
chalk
chalkboard
cheerful
child
class
classroom
clean
content
digits
education
equation
face
formula
girl
glasses
hand
high
intelligent
kid
knowledge
lesson
lighting
little
math
mathematics
mental
nerd
numbers
people
person
physics
pink
pupil
raised
result
ribbon
school
schoolgirl
smart
sponge
street
student
study
studying
wet
woman
work
writes
writing
young