英文關鍵字
accounts
addition
arithmetic
calculation
caucasian
center
child
childhood
children
class
classes
classroom
colored
colorful
education
elementary
granddaughter
grandmother
hand
helping
home
kids
kindergarten
knowledge
learning
lesson
math
mathematics
maths
numbers
people
preschool
preschooler
pupil
puzzle
school
schooling
solve
student
study
studying
subtraction
sum
teach
teacher
teaching
using
white
woman