Independent research and development of sound wave rebound silencer cavity, so that the sound in the cavity rebound to offset each other, to create a lightweight, comfortable, easy to wear silencer mask, in order to ensure that the effect of silencer at the same time to ensure the accuracy of the microphone picking sound, so that the parents and children in the daily communication of the sound of the mother tongue, stops within the mask, combined with the AI language conversion technology, to ensure that the child in any direction, can only hear the parents output of the foreign language, to create a purely foreign language communication environment for the child. Pure foreign language communication environment.