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What is "selective deafness"? Who can introduce it?

To put it bluntly, selective deafness means that some words can be heard clearly and some can't be heard clearly.

Sometimes there are jokes. This situation can be alleviated by wearing hearing aid headphones.

My girlfriend's grandmother, who is over 60, often can't hear clearly, so she bought a phonological kite-assisted earphone.

The effect is loud and clear, without noise. Now the old man goes dancing with his sisters every night.

More social life, better spirit than before ~?