英文關鍵字
background
basic
basics
black
calculate
calculating
calculation
calculations
class
classroom
color
concept
educating
education
educational
elementary
exercise
exercises
formula
fundamental
intelligence
knowledge
learn
learning
lesson
lessons
math
mathematical
mathematics
maths
number
numbers
paint
painted
painting
paints
paper
school
stroke
strokes
studies
study
studying
watercolor
watercolors
wet
white
write
writing
written