英文關鍵字
asking
questions
marks
background
sign
faq
frequently
asked
ask
icon
blackboard
pattern
chalkboard
question
answer
symbol
mark
help
set
many
chalk
concept
education
problems
green
board
search
school
information
query
hand
drawing
support
drawn
write
learn
illustration
idea
why
text
study
interrogation
sketch
learning
research
draw
knowledge
letter
lettering
questioning