英文關鍵字
advice
answer
ask
asked
asking
black
blackboard
board
chalk
chalkboard
class
coaching
communicate
draw
drawing
drawn
education
faq
frequently
guidance
hand
help
helpdesk
illustration
info
inform
information
informative
instruction
interrogation
learning
letter
lettering
manual
marks
query
question
questions
school
science
service
sign
study
studying
support
symbol
table
text
why
word