-In Milan, Italy, 1880, the hearing-impaired authorities ruled out the use of sign language teaching in the classroom and excluded deaf teachers from teaching in European schools; At the same time, American schools also suffered the same losses. Teachers in deaf schools originally accounted for 47% of all teachers, which was reduced to one figure.
-Almost all schools adopt oral teaching method instead of sign language teaching method, which makes the education of deaf children silent in the dark age of 100.
-Although a large number of studies show that deaf children had better learn by sign language, the education in deaf schools has not fully recovered from the heavy blow of Milan Conference and the sharp drop in the number of teachers in deaf schools.
-Sign language is different from other minority languages and is a visual language.
-Facial expression, body language and visual space position are all important parts of sign language.
-Although deaf people think they belong to a linguistic minority (research supports this view), the government and other institutions still label deaf people as "disabled".
At present, there are more than 4,000 recorded oral/written languages in the world. If more countries attach importance to sign language, this number will rise sharply.
-Language is the foundation of culture.