英文關鍵字
abc
aid
alphabet
american
and
asl
british
bsl
communication
deaf
deafness
disability
disabled
dumb
ear
easier
easy
education
fingers
fist
gestures
gesturing
hand
handicap
health
hearing
help
human
impairment
international
language
learn
lesson
letter
movement
mute
person
showing
sign
signal
speech
symbol
symbolic
teach
teacher
tutorial
visual