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Sign language is a do not use voice and gestures, body movements and facial expressions to convey the message language. However, the general public and sign language to convey is not common, because sign language is not a common language in the world. For the deaf, regardless of which language convey is very inconvenient thing.
YA-CHUN HU, YU-CHI TSAI, CHING-LAN HUANG, PO-YANG LIAO