audiphone
/ˈɔːdɪˌfəʊn/a type of hearing aid consisting of a diaphragm that, when placed against the upper teeth, conveys sound vibrations to the inner ear 助听器
noun [专属名词]（美）助听器（等于 dentiphone）
The doctor recommended an audiphone for the elderly gentleman who was struggling to hear conversations.
医生为这位听力困难的老年绅士推荐了一款助听器。
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