英文關鍵字
abacus
accountant
accounting
add
analyzing
arithmetic
baby
back
background
board
boy
boys
calculate
calculating
calculation
child
childhood
children
clever
close
concept
count
counting
development
doing
economy
educate
education
educational
fashioned
finance
finger
focus
foreground
hand
hands
hobby
home
homework
kid
kindergarten
learn
learning
lesson
macro
mathematics
old
play
playing
preschooler
progress
quarantine
retro
school
study
thinking
toddler
topic