英文關鍵字
academic
adult
blackboard
board
caucasain
classroom
closeup
college
concept
education
educational
elegant
english
formal
hand
handwriting
holding
human
inside
knowledge
language
learn
lesson
lifestyle
list
male
marker
modern
occupation
people
person
professional
school
studying
teacher
teaching
text
university
unrecognizable
unrecognized
vocabulary
welldressed
white
whiteboard
word
words
write
writing
young