英文關鍵字
advice
answer
black
blackboard
board
book
catalog
chalk
chalkboard
class
coaching
draw
drawing
education
faq
guidance
guide
guidebook
handbook
help
helpdesk
icon
illustration
info
information
instruction
know
knowledge
learn
learning
lecture
lesson
letter
library
manual
open
page
read
school
science
sign
sketch
study
support
symbol
text
textbook
training
user