From hearing a sound to reacting, how many barriers must a hearing impaired child pass?

This is why it is most commonly used in hearing and speech rehabilitation institutions to use percussion drums, gongs, cymbals and other audio equipment for auditory training.

Contribution: Peng Huihuan made in China

Link:      From hearing a sound to reacting, how many barriers must a hearing impaired child pass?

REF: Hearing aids ChinaITE hearing aidsBTE Hearing Aids
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