英文關鍵字
algebra
arithmetical
background
black
blackboard
board
calculate
calculation
calculations
chalk
chalkboard
chart
class
classroom
college
complex
complicated
drawing
drawings
education
equation
formula
formulas
graph
handwriting
illustration
intelligence
intelligent
knowledge
learn
lesson
math
mathematical
mathematics
maths
physics
school
science
scientific
solution
study
symbols
teach
teacher
technical
theoretical
theory
university
white
write