英文關鍵字
alone
attention
brain
calculating
child
clever
closeup
college
color
count
different
education
elementary
faculty
female
finger
formula
hand
human
idea
indoor
kid
kindergarten
knowledge
learn
lesson
little
logics
mathematics
minded
one
person
point
practice
pupil
room
school
science
shape
study
studying
train
unrecognizable
variety