英文關鍵字
background
black
blackboard
board
businessman
chalk
chalkboard
concept
education
handwriting
handwritten
knowledge
lesson
man
school
study
teach
teacher
text
training
university
white
writing
英文關鍵字
background
black
blackboard
board
businessman
chalk
chalkboard
concept
education
handwriting
handwritten
knowledge
lesson
man
school
study
teach
teacher
text
training
university
white
writing