Both Cerf and his wife, Sigrid, have hearing impairments.Cerf wears two hearing aids that enable him to not rely on lip reading or sign language.是什么意思_Both Cerf and his wife, Sigrid, have hearing impairments.Cerf wears two hearing aids that enable him to not rely on lip reading or sign language.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句