yé / ye / yīn / wèi / nián / jì / dà / le / ěr / duǒ / màn / màn / shī / cōng / le / xū / yào / dài / zhù / tīng / qì

爷爷因为年纪大了，耳朵慢慢失聪了，需要戴助听器。

Grandpa became hard of hearing due to his old age and needs to wear a hearing aid.